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Sommaire du brevet 2485327 

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(12) Demande de brevet: (11) CA 2485327
(54) Titre français: EPURATEUR D'AIR PORTATIF POUR POSTE DE TRAVAIL
(54) Titre anglais: PORTABLE BREATHING ZONE AIR CLEANER
Statut: Réputée abandonnée et au-delà du délai pour le rétablissement - en attente de la réponse à l’avis de communication rejetée
Données bibliographiques
Abrégés

Abrégé anglais


The objective of this invention is to provide a means of reducing personal
exposure indoors
to certain airborne contaminants including particulates and chemicals
including those
given off or generated by the individual or by his activities and thus avoid
subsequent
symptoms caused by inhaling these materials. The invention is for use indoors
by
individuals with hypersensitivity to certain airborne contaminants. This
invention provides
a solution to the problem of reducing human exposure to suspended particles
and other
airborne contaminants in indoor air that a person breathes. The invention is
an air
filtering/cleaning device that creates a region of slow laminar flow of clean
air in front of
the outlet of the filter, directing clean air to the user's breathing zone.
The filter is for use
by persons in bed or in a sitting location such as a desk or sofa. The slow,
laminar flow
does not cause discomfort to the user and at the same time displaces
contaminated room air
from the user's breathing zone.

Revendications

Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


Claims
1. An air cleaning device that effectively reduces human exposure to airborne
indoor
contaminants in sedentary or sleeping individuals.
2. An air cleaning device that is portable and adjustable for use in various
locations to
form a laminar, slow moving field of cleaned air near to and directed at the
face of
the person, effectively displacing (contaminated) ambient air.
3. Production of a laminar flow field is sufficiently slow that it does not
feel drafty or
bothersome to the user, does not disturb the user during sleep, rest or work
done in
front of it.
4. A device that blocks the lateral movement of room air on one side and
produces a
uniform displacement of room ambient air with clean air in a laminar, non-
mixing
manner on the opposite side to produce a clean air zone for the user.
5. A device that specifically provides the means by which human exposure to
airborne
contaminants can be reduced for sedentary or sleeping individuals by
displacing
contaminated air in their breathing zone and replacing it with clean air
within a
limited volume in front of the filter, rather than by mixing clean air with
room
ambient air.

Description

Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.


CA 02485327 2004-11-18
Description of the Invention
One embodiment of the invention includes a stable base (1) containing a fan or
blower (2),
an air intake opening (3), and a rigid passageway or air duct (4) for
directing the air to a
plenum (5). The passageway (4) is of a telescopingly adjustable length, making
use of a
sliding arrangement to adjust the height of the plenum above the floor and a
set screw to fix
the height (6). The plenum provides two functions: a partition that stops air
movement
horizontally and a support for a mechanical air filter (7) that also functions
as a diffuser of
air flow. During operation, air is drawn by the fan (2) into the air intake
(3) and blown
through the passageway (4) leading to the plenum (5). The air flow causes a
uniform
pressure to build-up uniformly inside the plenum (S) and consequently across
the
diffuser/mechanical air filter (7) installed on the open side of the plenum.
The cleaned air
exits perpendicularly to the face of the diffuser/mechanical air filter with
or without
activated charcoal (7) in a laminar flow pattern as a column of clean air (8)
emanating from
the face of the air filter, displacing the ambient air in the direction normal
to the face of the
diffuser/mechanical filter (?). The back of the plenum is solid and provides a
partition that
stops the movement of room air in the vicinity of the diffuser/mechanical air
filter.
The invention is shown in a sketch on Figure 1. The invention incorporates a
stable base( 1 ),
permitting the unit to stand adjacent to the side of a bed or at the head of a
bead, or beside a
desk or a chair, where the subject would normally spend a lot of time. The
height (above
the floor) of the plenum (5) with its diffuser/filter (7) attached is
adjustable to permit lining
up the centre of the outlet of the filter with the same height as the user's
face, so that the
face will intercept the column of filtered air emanating from the
diffuser/filter surface. In
this manner, the air cleaner effectively displaces the ambient air in the
subject's breathing
zone with filtered air. The filtered air emanates from the diffuser filter at
a velocity low
enough to prevent discomfort from drafts, yet high enough to cause a laminar
flow that
displaces ambient air in the breathing zone with little or no mixing. This
effect is achieved
at a velocity of the air emanating from the filter face (8) ranging between 2
and 5 inches per
second. In this range, air speed is sufficiently low to create a laminar flow
without causing
Saul Stricken November 19, 2004

CA 02485327 2004-11-18
Patent Application
for a Portable Breathing Zone Air Cleaner
the sensation of a draft within the space 6 inches to 36 inches in front of
the diffuser/filter.
A throughput of air of 10 to 25 cu ft per sq. ft of surface area of
diffuser/filter would result
in air flow velocity in the desired range of 2-5 inches/second. By trial and
error, this
velocity range was found to be acceptable to most subjects, yet permit, while
the fan or
blower is running, the formation of a moving column of air perpendicular to
the face of the
diffuser/filter with little mixing with ambient room air within a 36 inch
distance from the
face of the diffuser/filter. Higher velocities can cause the sensation of a
draft and
discomfort, especially for sedentary or supine subjects. Lower velocities may
not achieve
sufficiently uniform displacement of ambient air with filtered air to
significantly reduce
exposure of occupants to airborne contaminants in the local ambient air.
Construction
One embodiment of the invention is composed of four main components: a housing
(made
of coated wood or plastic producing no material emissions) that doubles as a
base with a
fan or blower with an air inlet and an air duct outlet, a plenum with an inlet
and with a large
outlet opening, and an air diffuser/filter covering the outlet opening of the
plenum.
Figures 2 and 3 illustrate one possible embodiment of the invention. Exploded
views with
typical dimensions of the base unit and of the plenum which holds the
diffuser/filter
element are shown. The length of the air duct outlet of the base is used to
adjustably join
the base unit to the plenum by a sliding telescoping connection, fixed by a
set-screw. The
telescoping connection is useful for adjusting (raising and lowering the
height of) the
diffuser/filter to optimize the flow of cleaned air into the subject's
breathing zone. All
materials used are selected for their low emission characteristics and where
necessary, are
coated with impervious low emission surface coatings such as shellac and
odorless paint
The resistance to air flow of the diffuser/filter is selected to cause a build-
up of pressure in
the plenum behind the diffuser/filter that is uniform across the entire face
of the filter. A
typical filter medium configuration is a 1" thickness of fibrous non-woven
fabric with a
covering on the front and back surfaces of non-woven single layer porous
fabric for
support of the filter medium. The fabric must be of a non-allergenic type of
material such
as polyester fiber. The combined resistance of the filter medium and the front
and rear
layers of fabrics is necessary to produce the required static pressure build
up in the plenum
to produce a uniform flow of air emanating perpendicularly from the surface of
the filter.
The Diffuser/filter element captures airborne particulates by mechanical
entrapment and
by adsorption to the fiber surfaces. The smallest particles may be attracted
to the fiber and
held there by Van der VVaal forces because of the low air velocity through the
filter medium.
The filter may also include adsorbing material such as activated charcoal to
remove
volatile organic compounds from the air. The filter has to be replaced
regularly in order to
maintain the air cleaner operating effectively.

CA 02485327 2004-11-18
Background
It has been established from field testing in houses that there is a strong
correlation between
indoor particulate levels and occupancy~2. The research showed that exposure
of house
occupants to airborne particles appears to be directly linked to their
activities when they are
in the home as a result of their movements. The furnace filter appears to have
only a small
to moderate effect on the exposure of an individual to respirable particles in
the home.
When occupants are moving around, they stir up the dust, and the dust cloud
"follows"
them around as they generate new clouds of dust. The dust in this cloud is
usually not
affected by the quality of the furnace filter or room air filter because the
filter is far away
from where the dust is being generated, and it normally takes several hours
for the dust to
be removed from most of the volume in the room, once all occupants have left
the room.
A certain percentage of the population have sensitivities to certain solid
particles such as
micro flora, micogens and mould spores and to gaseous chemicals dissolved in
the air in a
building such as volatile organic compounds (VOCs) from perfumes, from moulds
or
materials on their own skin and hair, as well as from chemicals and solvents
such as
formaldehyde. Individuals who are hypersensitive to long-term exposure to some
of these
materials and chemicals may exhibit certain reactions such as an immune
response to
respiratory exposure to the allergen, with resulting symptoms such as such as
asthma,
bronchitis, allergic rhinitis, nasal congestion, sleep disturbance and in
extreme cases, if
uncorrected, altered brain function.
Humans, pets and materials such as carpeting generate airborne particulates
such as
allergens, molds, bacteria, viruses and chemicals that spread out into the
occupied space.
The rate of production of particles associated with human activities and
occupancy indoors
is normally much higher than the rate of removal of particles from the air by
room-by-room
or central air cleaners. The result is that conventional mechanical air
cleaners produce a
small or insignificant reduction in the level of air contaminants surrounding
a person, and
thus produce a small reduction in human exposure to indoor levels of
particulates or
chemicals in the air that the person breathes indoors.

Dessin représentatif
Une figure unique qui représente un dessin illustrant l'invention.
États administratifs

2024-08-01 : Dans le cadre de la transition vers les Brevets de nouvelle génération (BNG), la base de données sur les brevets canadiens (BDBC) contient désormais un Historique d'événement plus détaillé, qui reproduit le Journal des événements de notre nouvelle solution interne.

Veuillez noter que les événements débutant par « Inactive : » se réfèrent à des événements qui ne sont plus utilisés dans notre nouvelle solution interne.

Pour une meilleure compréhension de l'état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , Historique d'événement , Taxes périodiques et Historique des paiements devraient être consultées.

Historique d'événement

Description Date
Le délai pour l'annulation est expiré 2009-11-18
Demande non rétablie avant l'échéance 2009-11-18
Inactive : Demande ad hoc documentée 2009-08-20
Réputée abandonnée - omission de répondre à un avis sur les taxes pour le maintien en état 2008-11-18
Lettre envoyée 2007-02-13
Exigences de rétablissement - réputé conforme pour tous les motifs d'abandon 2007-01-26
Réputée abandonnée - omission de répondre à un avis sur les taxes pour le maintien en état 2006-11-20
Demande publiée (accessible au public) 2006-05-18
Inactive : Page couverture publiée 2006-05-17
Inactive : CIB en 1re position 2005-01-13
Exigences de dépôt - jugé conforme 2004-12-14
Demande reçue - nationale ordinaire 2004-12-14
Inactive : Lettre officielle 2004-12-14
Inactive : Certificat de dépôt - Sans RE (Anglais) 2004-12-14
Déclaration du statut de petite entité jugée conforme 2004-11-18

Historique d'abandonnement

Date d'abandonnement Raison Date de rétablissement
2008-11-18
2006-11-20

Taxes périodiques

Le dernier paiement a été reçu le 2007-10-15

Avis : Si le paiement en totalité n'a pas été reçu au plus tard à la date indiquée, une taxe supplémentaire peut être imposée, soit une des taxes suivantes :

  • taxe de rétablissement ;
  • taxe pour paiement en souffrance ; ou
  • taxe additionnelle pour le renversement d'une péremption réputée.

Veuillez vous référer à la page web des taxes sur les brevets de l'OPIC pour voir tous les montants actuels des taxes.

Historique des taxes

Type de taxes Anniversaire Échéance Date payée
Taxe pour le dépôt - petite 2004-11-18
TM (demande, 2e anniv.) - petite 02 2006-11-20 2007-01-26
Rétablissement 2007-01-26
TM (demande, 3e anniv.) - petite 03 2007-11-19 2007-10-15
Titulaires au dossier

Les titulaires actuels et antérieures au dossier sont affichés en ordre alphabétique.

Titulaires actuels au dossier
SAUL STRICKER
Titulaires antérieures au dossier
S.O.
Les propriétaires antérieurs qui ne figurent pas dans la liste des « Propriétaires au dossier » apparaîtront dans d'autres documents au dossier.
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Description du
Document 
Date
(aaaa-mm-jj) 
Nombre de pages   Taille de l'image (Ko) 
Abrégé 2004-11-18 1 26
Description 2004-11-18 3 189
Revendications 2004-11-18 1 28
Dessins 2004-11-18 3 88
Dessin représentatif 2005-03-07 1 9
Page couverture 2006-05-09 1 41
Certificat de dépôt (anglais) 2004-12-14 1 158
Avis de rappel: Taxes de maintien 2006-08-21 1 119
Courtoisie - Lettre d'abandon (taxe de maintien en état) 2007-01-15 1 175
Avis de retablissement 2007-02-13 1 165
Avis de rappel: Taxes de maintien 2007-08-21 1 121
Avis de rappel: Taxes de maintien 2008-08-19 1 121
Courtoisie - Lettre d'abandon (taxe de maintien en état) 2009-01-13 1 173
Deuxième avis de rappel: taxes de maintien 2009-05-20 1 118
Rappel - requête d'examen 2009-07-21 1 115
Avis de rappel: Taxes de maintien 2009-08-19 1 128
Correspondance 2004-12-14 1 13
Taxes 2007-01-26 1 43
Taxes 2007-10-15 1 65