Language selection

Search

Patent 2417684 Summary

Third-party information liability

Some of the information on this Web page has been provided by external sources. The Government of Canada is not responsible for the accuracy, reliability or currency of the information supplied by external sources. Users wishing to rely upon this information should consult directly with the source of the information. Content provided by external sources is not subject to official languages, privacy and accessibility requirements.

Claims and Abstract availability

Any discrepancies in the text and image of the Claims and Abstract are due to differing posting times. Text of the Claims and Abstract are posted:

  • At the time the application is open to public inspection;
  • At the time of issue of the patent (grant).
(12) Patent Application: (11) CA 2417684
(54) English Title: LIQUID CONTAINER
(54) French Title: CONTENANT A LIQUIDE
Status: Dead
Bibliographic Data
(51) International Patent Classification (IPC):
  • B65D 77/06 (2006.01)
(72) Inventors :
  • PHILIPS, NICHOLAS A. (United States of America)
  • WALLICK, SCOTT A. (United States of America)
  • MCKENNA, DAVID J. (United States of America)
  • MUISE, HERBERT D. (United States of America)
  • SPRINGHORN, MICHELLE A. (United States of America)
(73) Owners :
  • INTERNATIONAL PAPER COMPANY (United States of America)
(71) Applicants :
  • WEYERHAEUSER COMPANY (United States of America)
(74) Agent: GOWLING LAFLEUR HENDERSON LLP
(74) Associate agent:
(45) Issued:
(22) Filed Date: 2003-01-30
(41) Open to Public Inspection: 2003-08-26
Examination requested: 2007-09-14
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): No

(30) Application Priority Data:
Application No. Country/Territory Date
10/086,004 United States of America 2002-02-26

Abstracts

English Abstract



A shipping container for liquids is described. This consists of an outer
corrugated paperboard container containing an inner corrugated liner forming
corner
posts. A flexible or semi-flexible bladder or jug generally conforming in
cross section
to the inside of the corrugated container contains the liquid. It is desirable
for the in-
ner corrugated liner to be bonded to the outer container, especially along the
margins
of the corner posts. It has been found to be critical that the ratio of the
length of the
outside face of the outer container to the corner post length should be no
greater than
about 8:1. This is essential to prevent face bulging, especially when the
inner plastic
container is filled with a high density material such as a paint. Where the
inner plastic
container has an upstanding handle or spout it is useful to have filler pieces
that bear
between the plastic container and upper flaps of the outer corrugated
container. This
prevents any up and down motion of the inner container during normal handling
or
under the severe stresses that might be imposed on a paint shaker.


Claims

Note: Claims are shown in the official language in which they were submitted.



12

Claims:

1. A container for liquid materials which comprises an inner flexible
liquid-tight plastic container and an outer corrugated paperboard container,
the outer
container being generally rectangular in cross section and having top, bottom
and
sidewall portions;
an octagonal secondary sidewall having face and corner sections
snugly inserted within the outer container so as to form vertically oriented
corner
posts;
the inner plastic container as seen in cross section being of an octago-
nal cross section so as to fit conformingly within the secondary sidewall, the
plastic
container having a spout and an optional handle on an upper surface and being
acces-
sible through the top portion of the outer corrugated container.

2. The container of claim 1 in which the ratio of length of any face of
the outer container to the length of the corner sections of the secondary
sidewall is no
greater than about 8:1.

3. The container of claim 2 in which the ratio of length of any face of
the outer container to the length of the corner sections of the secondary
sidewall is
within the range of about 3.3:1 to about 8:1.

4. The container of claim 1 in which the secondary sidewall is adhe-
sively bonded to the outer corrugated container.

5. The container of claim 1 in which there is a space between the top of
the outer corrugated container and the inner plastic container, the space
being suffi-
cient to accommodate the spout and a handle, if one is present.

6. The container of claim 5 in which there is at least one filler piece
between the top of the inner plastic container and top of the corrugated outer
container
to restrain relative motion between the two.



13

7. The container of claim 6 in which the spout is centrally located adja-
cent an edge of the inner container and the filler piece comprises two
sections, one
section being located on each side of the spout.

8. The container of claim 7 in which the filler piece sections are of
separate construction from the top of the outer corrugated container.

9. The container of claim 7 in which the filler piece sections are inte-
gral with the top flaps of the outer corrugated container.

10. The container of claim 1 in which the inner plastic container has an
upper surface and an upstanding handle, an inner plastic container rotation
control
means being located above the upper surface, the rotation control means being
formed
from corrugated paperboard and sized to bear against the walls of the outer
container,
the paperboard having apertures permitting passage of the spout and the handle
of the
inner plastic container.

11. The container of claim 10 in which the inner plastic container han-
dle is generally in the form of an inverted U with upstanding legs and a
connecting
cross piece, the rotation control means having apertures permitting passage of
the legs
of the handle, the apertures being connected by a slit to permit the cross
piece of the
handle to be pushed through for access.

12. The container of claim 6 in which the inner plastic container has
an upper surface and an inner plastic container rotation control means located
between
the upper surface and the filler piece or pieces.

13. The container of claim 12 in which the inner plastic container has
an upstanding handle and the rotation control means is formed from corrugated
pa-
perboard sized to bear,against the walls of the outer container, the
paperboard having
apertures permitting passage of the spout and the handle of the inner plastic
container.


14

14. The container of claim 13 in which the inner plastic container han-
dle is in the form of an inverted U with upstanding legs and a connecting
cross piece,
the rotation control means having apertures permitting passage of the legs of
the han-
dle, the apertures being connected by a slit to permit the cross piece of the
handle to
be pushed through for access.

15. The container of claim 1 in which the spout and optional handle
may be formed or telescoped within the top of the inner plastic container and
the top
of the inner plastic container is flush with and contacts the top flaps of the
outer cor-
rugated container.


Description

Note: Descriptions are shown in the official language in which they were submitted.


CA 02417684 2003-O1-30
LIQUID CONTAINER
The present invention is directed to a shipping container for liquids.
This is of the type in which a thin plastic inner container for the liquid is
placed
within a corrugated outer container for structural rigidity and protection.
The con-
tainer is particularly suitable for products such as paints that must be
severely agitated
in the container to disperse and homogenize the contents before use.
Background of the Invention
It has been common practice for many years to ship liquid materials
contained within plastic bags enclosed in a rigid outer container. One might
note U.S.
Pat. No. 4,174,051 to Edwards et al. as an example. This patent shows a
corrugated
box containing a flexible plastic inner container with a pull-up spout for
filling and
dispersing the liquid contents.
Rutter, U.S. Pat. No. 4,322,018, is primarily directed to .a valve with
means to pierce an otherwise imperforate bag at the time of use. The patent
shows a
liquid filled bag within a corrugated paperboard container having a keyhole-
shaped
portion that can be opened for access to the valve.
Cox, Jr., in U.S. Pat. No. 3,100,587 shows a liquid container having a
plastic bag within a containerboard box. The bag has a capped pouring tube
afl:ixed
by a wire tie to a tab on one of the inner upper flaps of the container. When
the
overlying outer flap is opened the tab with its affixed tube is exposed.
Nichols, in U.S. Pat. No. 5,029,734, shows a reusable pallet mounted
molded plastic container enclosed within a reinforcing containerboard shell.
Simi-
larly, Perkins, in U.S. Pat. No. 5,813,562, is another pallet mounted
container having
an interior collapsible plastic bag within exterior multiwalled containerboard
in the
form of a regular octagon. This particular construction enables the bag, with
a lower
drain, to be conveniently installed from the bottom of the exterior container.
Containers having a bag within a box and permanently mounted exte-
rior spouts have also been used for many years. Exemplary among these might be
noted the following U. S. Patents: Parker, 2,973,119; McCullough et al.,
4,696,840;
Gordon et al., 5,156,295; and Voorhies Jr., 4,793,519 and 4,930,661.

CA 02417684 2003-O1-30
2
Baker, in U. S. Pat. Nos. 5,348,186 and 5,474,203, shows a bag within
a multipiece octagonal exterior corrugated container. These patents are
especially di-
rected to a construction that maintains an upper spout locked in place to
accept a hand
pump. Openings at the top of the container allow it to be handled by a
conventional
barrel hand truck. A similar plastic bag within an octagonal corrugated outer
con-
tainer is shown in Benner et al., U.S. Pat. No. 5,749,489, although in this
case the in-
ner container has a bottom drain.
More commonly, liquid materials in larger quantities have been
shipped within metal drums or in metal or plastic buckets of various sizes.
Buckets
are frequently of about 5 gallon (~20 L) capacity so that they can be readily
handled.
When shipping paints and other compositions that may contain a significant
percent-
age of suspended solid materials, these buckets typically have removable heads
cov-
Bring the entire top. Again using paints as an example, the buckets are
palletized for
shipping and at the point of use individual buckets may be placed on a shaker
to dis- .
perse the pigment and/or other solid components. The action of the shaker is
quite
violent, as anybody who has observed a smaller shaker in a paint store can
testify.
Containers must be capable of withstanding severe forces during ship-
ping and use. There are significant disadvantages to shipping palletized
buckets.
Foremost among these are the inefficient use of space on the pallet and the
hazard of
the outermost buckets inadvertently slipping off the edges. Depending on the
par-
ticular bucket size and configuration on the pallet, as much as half of the
pallet sur-
face may be underutilized. Another disadvantage is that the upper surface of
the
buckets provides an unstable and irregular bearing surface for stacking
additional
pallets. One proposed solution to the above problems has been to ship the
paint
within a plastic bag contained in a corrugated paperboard shipping container.
This
has had only limited success for a number of reasons. The entire inner and
outer
container must be strong enough to withstand stacking and the action of the
shaker.
Many times the material shipped is a tint base and various customized pigments
are
added at the point of use and the inner container must be able to accommodate
this
added material. If the inner container is not completely filled the contained
liquid can
slosh violently back and forth during shaking. For this reason, and to exclude
air
from leftover contents, the inner container is usually flexible enough so that
it can be
nartialIy collapsed after partial removal of the contents.

CA 02417684 2003-O1-30
3
It is highly undesirable to have to open the top flaps of the container
for access to the spout; e.g., to add pigment. The container then loses much
of the
strength needed on the shaker and during subsequent handling, as when the
container
is picked up to pour paint into a smaller working container. Cartons may be
designed
with an opening for the spout, as in the aforenoted Edwards et al. patent, but
these are
effective only if the spout is always located exactly under the opening.
During ship
ping, and especially during shaking, there is a strong tendency for the filled
bags to
rotate within the container so that an originally properly located spout is
then nowhere
to be found without tearing open the top flaps. Rotation during shaking can
also re
suit in abrasion and failure of the inner bag.
The present invention overcomes the deficiencies just noted and pro-
vides an effective plastic container-within-a-box for paints and many other
liquid
materials.
I S Summary of the Invention
The invention is a shipping container for liquid materials comprising
the combination of a relatively lightweight liquid tight flexible or semi-
flexible blad-
der or jug within a corrugated paperboard outer carton. An upper access spout
with a
removable cap is normally integral with the jug. The construction is designed
to
minimize relative motion between the inner plastic portion and the outer
corrugated
container during use. This use may vary from low energy routine handling to
high
energy shaking. By minimizing relative motion between the inner plastic
container
and outer corrugated paperboard, any tendency to create stress points and form
leaks
in the plastic inner container is controlled.
In the past with bag-in-a-box construction, the inner plastic containers
have usually been a simple rectangular flat bag within a conventional
corrugated
container. Alternatively, a blow-molded jug having a rectangular cross section
with
rounded corners has been used. When such a container is used for paint it must
be
able to withstand severe shaking at the time of use to uniformly disperse the
pigments.
This is an extreme requirement for a container. Not only must it have
sufF~cient
strength to permit stacking multiple heavy units, it be strong enough to
withstand
rough handling on the shaker. Further, it must retain sufficient strength even
the ex-
treme humidity of a Southeastern summer. It is well established that at 90%
relative

CA 02417684 2003-O1-30
4
humidity the edge compression strength of most corrugated board drops to about
half
that at 50% R.H.
When attempts have been made to package paint in a bag-in-a-box-
type container, the bags or jugs have been subject to failure during shaking.
This fail-
ure might be as minor as pin hole leaks or as major as catastrophic tears.
Neither is
acceptable. A significant part of the problem appears to be due to movement of
the
plastic container within the outer box during shaking. In one attempt to make
a more
satisfactory paint container, a conventional blow molded bladder or jug was
placed in
a corrugated container having corner posts. This construction initially
failed. As the
plastic container attempted to conform to the corner posts, the resulting
wrinkles or
folds created stress points that led to pinhole failures. Further, bulging of
the corru-
gated box sidewalls permitted excessive movement of the paint filled bladder
within
the container. Bulging, in effect, increases the volume of the corrugated
container and
allows the inner plastic container to rotate and/or bounce up and down. In
addition to -
causing leaks, this bouncing or rotation can occur at a frequency that will
significantly
increase the load on the shaker to the point that the motor will overload and
shut
down.
A major solution to the above problems has been the use of corner
posts in the corrugated outer container that are sufficiently long to prevent
face bulg-
ing during shaking. A second part of the solution is to use an inner plastic
container
that will closely conform in cross section to the inside of the outer
corrugated con-
tainer in order to eliminate the wrinkling or creasing and subsequent leak
formation.
The shipping container overall is configured as a rectangular parallele-
piped which may be square or rectangular when seen in plan view. An outer
corru-
gated portion will be of sufficiently heavy one-piece construction as could be
easily
determined by a skilled packaging engineer. The outer portion has a
conventional
side wall section and top and bottom sections comprising overlapping flaps.
This is
fitted with a snugly fitting interior insert comprising a corrugated secondary
sidewall
with truncated corners so that it is octagonal in plan view. The secondary
sidewall
provides reinforcement of the outer sidewalls while the truncated corners act
as verti-
tally oriented corner posts. Most preferably, the secondary sidewall is
adhesively
bonded to the outer container, at least along the margins of the corner posts.
As seen
in plan view, the ratio of the length of the sidewalls of the outer container
to the

CA 02417684 2003-O1-30
length of the corner sections. of the interior insert had been found to be
critical. This
should be no greater than about 8:1 and will fall within the range of about
3.3:1 to 8:1.
Construction within this ratio is essential to prevent bulging of the face
portions that
might be caused by the high stresses experienced during shaking of container
filled
5 with a heavy material such as paint. The length of the corner posts must be
sufficient,
within the 3.3:1 to 8.1 range, to prevent sidewalI bulging, but preferably the
length is
held to the minimum necessary to reduce lost space within the container.
The inner liquid tight plastic container will normally have an integral
spout for filling and accessing the contents and may, optionally, have an
integrally
I O molded handle. Both spout and handle, if present, may be permanently
upstanding or
they may be conventionally formed or telescoped down below the top surface of
the
container. In the case where the spout and handle are upstanding, there will
normally
be a space between the inner plastic container and the upper flaps of the
outer corru-
gated container. This space is necessary so that the spout and handle do not
protrude
above the top surface where they would interfere with stacking. The area of
this
space should be wholly or in part filled with a filler piece or pad to reduce
or prevent
vertical displacement of the plastic container during handling or shaking. It
is also
desirable to have some means within this space to restrain rotation of the jug
or blad-
der. The filler pieces may be as simple as several thickness of
containerboard. Mate-
rial for their construction is not critical and there are many options besides
container-
board. These may be separate from the main outer container or may be
integrally
formed on opposing upper flaps. Preferably they are located symmetrically on
either
side of the spout, the spout normally being located centrally along one edge
of the top
surface of the jug. Normally the filler pieces would be bonded into place to
prevent
movement during handling or shaking. If the spout and the handle, if one is
present,
are recessed below the upper surface of the plastic container the filler
pieces are un-
necessary and the top flaps of the outer corrugated container can be located
directly
against the upper surface of the plastic container.
The plastic jug or bladder would normally be blow molded from poly-
ethylene or a similar material. Preferably it should have sufficient
flexibility so that it
can be at least partially collapsed prior to filling or following withdrawal
of some of
the contents. This flexibility is desirable to minimize the amount of space
required to
inventory the containers prior to filling and for ultimate disposal.

CA 02417684 2003-O1-30
6
The invention thus consists of an outer corrugated container, an inner
octagonal secondary corrugated sidewall forming corner posts, and a space
conform-
ing octagonal liquid-tight plastic inner container. The ratio of the lengths
of the face
portion of the outer container sidewali to the corner sections should bP no
greater than
about 8:1.
It is an object of the invention to provide a container for Liquids that is
lightweight, disposable, and which will withstand severe external forces
during ship-
ping and downstream handling.
It is another object to provide a container for liquids having an inner
plastic container within a corrugated outer shipping container.
It is a further object to provide a container for paints that is resistant to
developing leaks when the contents are dispersed on a shaker.
It is yet an object to provide a paint container that will withstand the
forces delivered by a paint shaker yet will not induce an excessive load on
the shaker
motor or mechanism.
It is an additional object to provide a container for liquids that is col-
lapsible when empty to minimize storage space for the containers before and
after use.
These and many other objects will become readily apparent upon
reading the following detailed description taken in conjunction with the
drawings.
Brief Description of the Drawings
FIG. 1 is an exploded view of the container of the present invention.
FIG. 2 is a perspective view showing the assembly steps of the con-
tainer of FIG. 1.
FIGS. 3 and 4 show alternative top spacer units for the FIG. 1 con-
tainer.
FIG. 5 is an exploded view of an alternative configuration in which the
interior container handles are depressed so that they are flush with the upper
surface.
FIGS. 6 and 7 show the assembled package using the interior container
of FIG. 5.
FIG. 8 shows an additional design for the spacer units for the FIG. 1
container.

CA 02417684 2003-O1-30
7
FIG. 9 illustrates an alternative construction for the bladder rotation
means.
Description of the Preferred Embodiments
Referring now to the drawings, FIG. 1 shows the container of the pres-
ent invention. This comprises an outer corrugated box 2 having face panels 4
and up-
per flaps 6, 6', and 8, 8'. Similar flaps, not shown, are present to form a
bottom clo-
sure. An insert portion 10, also of corrugated board, fits snugly within outer
box 2.
The insert has face panels 12 and truncated corners 14 that serve as top-to-
bottom
~ corner posts. The insert can be formed from one or more individual pieces
and is
most preferably adhesively bonded to the outer box, especially along the edges
of the
corner posts. A blow molded or similarly formed semi-flexible octagonal
plastic
bladder or jug 16 fits snugly within the corrugated insert 10. The jug has
face por-
tions 18 and corner sections 20 that correspond to and are closely configured
to the
I S interior of insert 10. A spout and cap 22 are located on the upper surface
of the jug,
as is an optional handle 24. Above the jug is an optional sheet of corrugated
board 26
having cutouts 28 and 30 to pass through the spout and handle of the jug. This
piece
is useful to restrain rotational movement of the jug during shaking. Finally
filler
pieces or pads 32, which may be formed of corrugated board or any other
material,
are located on each side of the spout and handle and preferably bonded to
sheet 26.
These correspond in thickness to the height of the spout and handle and bear
against
the upper flaps 6, 6', 8, 8' when closed. The filler pieces serve to prevent
upward
movement of the jug when the package is closed or during agitation on a
shaker.
Referring now to FIG. 2, assembly steps of the container are shown.
Insert 10 is first placed within the outer box 2 then jug 16 is slid inside
the insert. The
upper sheet of corrugated board 2b is placed on top of jug 16 then the pads 32
are laid
along each side of the spout 22. Side flaps 6, 6' are first closed to retain
pads 32 the
front and rear flaps 8, 8' are closed and glued to flaps 6, 6' to complete the
container
40.
FIG. 3 shows one of several possible alternative configurations of the
container. Here the separate upper insert 26 and filler pieces 32 shown in
FIGS. 1 and
2 are replaced by a piece generally seen at 42 in which the insert 44 and
filler pieces
46 are formed from a single piece of corrugated board. Another alternative is
seen in

CA 02417684 2003-O1-30
8
FIG. 4 in which side flaps 6 of the outer container 2 are modified and the
filler pieces
are formed integrally from extended side flaps 50 by bending along score lines
52.
Another alternative construction, shown in FIG. 5, would employ a
bladder or jug 50 in which the spout 52 and handle 54, if present, would be
placed
below the upper surface of bladder or jug 50. A handle can be conveniently be
lo-
Gated within a depressed portion of the upper surface and a well known
telescoping or
popup-type spout used in place of the one shown in the earlier figures. In
this case the
filler pieces shown earlier would not normally be required since the upper
surface of
the inner plastic bladder or jug could be flush and in contact with the top
flaps 6, 6', 8,
8' of the outer corrugated container. In FIGS. 6 and 7 the bladder SO is shown
in-
serted into the corrugated container at 56 and the completed container with
the upper
flaps sealed at 58.
Where the container must withstand very severe handling forces, such
as a paint shaker, it is desirable to fill the space above the rotation
prevention sheet 26
1 S and the upper flaps 6, 6', 8, 8' to the maximum extent reasonable. FIG. 8
shows a
construction 60 for the filler pieces that serves this purpose. It is also
desirable that
the filler pieces, whether of construction 32, 46, or 60, be relatively rigid
so that they
do not deform by racking or in other ways when subject to the forces of a
paint
shaker. Preferably, if corrugated paperboard is used, they will have a minimum
of
interior void space, other than that within the interior of corrugations. In
addition to
the constructions shown, fan-folded corrugated board, rigid foam materials,
honey-
comb, wood, etc. are all suitable. The rotation prevention sheet 26 may also
be
formed somewhat differently to assist in reducing tendency of the interior
bladder or
jug to rotate during shaking. Rather than the simple slot 30 seen in the
earlier figures,
FIG. 9 shows a preferred construction. The jug or bladder handle 24 is in .the
form of
an inverted U having upstanding legs and a connecting crosspiece. Two holes
62,
large enough to pass the legs of the handle, are punched in the sheet. These
are. con-
nected by a slit 64, embraced by score lines 66, that permit the handle to be
.pushed
through. After the handle 24, shown here in phantom view, is inserted the
container-
board on both sides of the slit closes and the two adjoining sides bear
against each
other to provide extra strength.

CA 02417684 2003-O1-30
9
Example 1
A shipping container approximately 14 inches (35.6 cm) high and of
X 12 inch (25.4 X 30.5 cm) square cross section was formed from corrugated
board having 56 pound liners and 36 pound corrugated medium (274-176-274
kg/m2).
5 A snugly fitting insert formed from two pieces of the same board was used to
double
the sidewall thickness. A generally rectangular-shaped plastic jug having an
integral
handle and spout and having an approximate 10 X 12 inch (25.4 X 30.5 cm) cross
section was placed within the corrugated container. The jug had a wall
thickness in
the range of 0.04-0.06 inches (1.0-1.5 mm) with each edge being rounded on an
ap-
10 proximate 3/4 inch (19 mm) radius. Filler pieces were placed between the
upper sur-
face of the jug and the top of the outer container, the top flaps of the outer
container
were closed and sealed, and the jug was then filled with paint. The filled jug
was then
placed on a Harbil SG model paint shaker supplied by Fluid Management, Inc.
Wheeling, Illinois. Paint shakers are available from a number of manufacturers
and
this should not be considered as an endorsement of this particular piece of
equipment
over others that are available. The shaker has a pair of separated platens
that squeeze
together to hold the paint container during shaking. These platens place a
force of
about 800-1200 pounds (3600-5400 N) on the container to hold it in place. The
shaker vibrates via a belt driven offset cam mechanism at about 600
cycles/minute
and is powered by a 3/. hp (0.56 kW) motor equipped with a current overload.
The
shaking time can be adjusted up to a maximum of 3 minutes.
For this and all subsequent tests the containers were conditioned to
equilibrium at 90% relative humidity prior to testing. The motor was started
with the
paint filled container on the shaker but after about 1 minute the motor
overloaded and
kicked out due to overheating. Apparently, sidewall bulging of the corrugated
con-
tainer had allowed the interior plastic container to move at a different
vibration rate
than the shaker. The movement of the paint-filled plastic interior container
evidently
began increasing resistance to the motion of the vibrating platens so that a
motor
overload occurred.. No leaks were observed in the plastic inner container.
However,
agitation time to achieve good paint mixing was regarded as insufficient.

CA 02417684 2003-O1-30
Example 2
A second container was formed in all ways similar to that of Example
1 with the exception that the inner liner of the corrugated container was
formed to
provide i inch (25 mm) corner posts, this measurement being the length of the
trun-
5 Gated corner portions. Again, the paint shaker motor overloaded and shaking
could not
proceed beyond about 1-1'/2 minutes. Some wrinkling was noted in the interior
plastic
container where it contacted the corner posts. This wrinkling created stress
points that
caused pinholes to develop during shaking and paint leaks to occur.
A similar container was formed except that the length of the corner
10 posts was increased from 1 inch to 2 inches (from 2.5 to 5.1 cm). This time
the motor
did not overload for the full 3 minute shaking period. However, upon
examination,
pinhole leaks were again noted where the corners of the jug had become
deformed
and wrinkled from contact with the corner posts in the corrugated container.
Similar
results were noted when the corner post length was extended to 3 inches (7.6
cm).
Example 3
While not in any way limiting of the invention, an outer container size
is 10 X 12 inches (254 X 305 mm) in cross section and 14 inches (356 mm) high
is
convenient. This enables 16 containers each holding 5 gallons (18.9 L) or 20 L
to be
placed on a standard 40 X 48 inch (1.02 X 1.22 m) Grocery Manufacturers
Associa-
tion (GMA) pallet. In this example the outer container was constructed from a
corru-
gated board having a 69 pound liners and a 36 pound corrugated interior
construction
(336-176-336 kg/m2). The secondary sidewall or inner liner was formed in two
pieces
and used to provide corner posts having a 1.5 inch (38 mm) length. This was
con-
veniently formed from a corrugated board of similar weight to the outer box
and was
spot bonded to the outer container. It is especially important that the area
along the
edges of the corner posts be bonded to the outer container. The inner liner
may be
made in either one or two piece construction. While other constructions of the
comi-
gated components are possible, those just described use a minimum of fiber to
ac-
complish the reduired result. For a box having a major face 12 inches (305 mm)
long,
extensive experimentation has shown that the length of the corner post section
of the
secondary sidewall should be at least 1.5 inches (38 mm) and preferably less
than 3
inches l76 mml. With a 1.5 inch corner host the ratio of face length to corner
host

CA 02417684 2003-O1-30
11
length is 8:1 for the 12 inch dimension of the outer container and 6.7:1 for
the 10 inch
dimension. It appears critical that this ratio should not exceed about 8:1 if
sidewall
bulging is to be prevented. For other sizes of outer containers these lengths
may be
adjusted somewhat as long as the maximum ratio of length face length to corner
post
is not exceeded. It is desirable from the point of minimizing unused space
within the
container to reduce corner post length to the minimum necessary to provide
adequate
top-to-bottom stiffness, prevent bulging, and prevent inner container
movement.
Shorter corner post lengths; e.g. those greater than about 8:1 ratio of face
to corner
post length have been found to permit considerable movement of the interior
con-
tainer within the outer container. This usually results in breaker kick-out of
the paint
shaker and/or leak formation within the inner plastic container.
A new design bladder or jug having an octagonal cross section was
used. The corners were about 2 inches (50.8 mm) wide so that the jug conformed
closely to the interior dimensions of the corrugated container. ' This design
permits the
IS container filled with paint and conditioned to equilibrium at 90% relative
humidity to
shake a full 3 minutes without motor overload. Movement of the plastic
container
within the corrugated container was minimized during shaking. and no wrinkling
or
pinhole leaks occurred.
Having described the best mode of construction of the container, it will
be evident to those skilled in the art that there may be other possible
variations in the
design that are not described herein. These should be considered within the
purview.
of the invention if encompassed within the following claims.

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date Unavailable
(22) Filed 2003-01-30
(41) Open to Public Inspection 2003-08-26
Examination Requested 2007-09-14
Dead Application 2010-02-01

Abandonment History

Abandonment Date Reason Reinstatement Date
2009-01-30 FAILURE TO PAY APPLICATION MAINTENANCE FEE

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Registration of a document - section 124 $100.00 2003-01-30
Application Fee $300.00 2003-01-30
Maintenance Fee - Application - New Act 2 2005-01-31 $100.00 2004-12-09
Maintenance Fee - Application - New Act 3 2006-01-30 $100.00 2005-12-08
Maintenance Fee - Application - New Act 4 2007-01-30 $100.00 2006-12-13
Request for Examination $800.00 2007-09-14
Maintenance Fee - Application - New Act 5 2008-01-30 $200.00 2007-12-24
Registration of a document - section 124 $100.00 2008-10-07
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
INTERNATIONAL PAPER COMPANY
Past Owners on Record
MCKENNA, DAVID J.
MUISE, HERBERT D.
PHILIPS, NICHOLAS A.
SPRINGHORN, MICHELLE A.
WALLICK, SCOTT A.
WEYERHAEUSER COMPANY
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

To view selected files, please enter reCAPTCHA code :



To view images, click a link in the Document Description column. To download the documents, select one or more checkboxes in the first column and then click the "Download Selected in PDF format (Zip Archive)" or the "Download Selected as Single PDF" button.

List of published and non-published patent-specific documents on the CPD .

If you have any difficulty accessing content, you can call the Client Service Centre at 1-866-997-1936 or send them an e-mail at CIPO Client Service Centre.


Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Abstract 2003-01-30 1 28
Description 2003-01-30 11 613
Claims 2003-01-30 3 98
Drawings 2003-01-30 4 121
Representative Drawing 2003-07-29 1 11
Cover Page 2003-07-29 2 49
Prosecution-Amendment 2007-09-14 2 40
Assignment 2003-01-30 9 408
Correspondence 2008-10-07 2 59
Correspondence 2008-10-17 1 15
Correspondence 2008-10-17 1 18
Assignment 2008-10-07 19 913