Canadian Patents Database / Patent 2897625 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: (11) CA 2897625
(51) International Patent Classification (IPC):
  • F23J 13/08 (2006.01)
(72) Inventors (Country):
  • THOMPSON, PETER R. (Canada)
(73) Owners (Country):
  • THOMPSON, PETER R. (Canada)
(71) Applicants (Country):
  • THOMPSON, PETER R. (Canada)
(74) Agent: NA
(45) Issued: 2017-05-30
(22) Filed Date: 2014-08-07
(41) Open to Public Inspection: 2015-03-16
Examination requested: 2015-07-17
(30) Availability of licence: N/A
(30) Language of filing: English

English Abstract

The "Double Wall Insulated Cap", a device that when used will conserve heat in a dwelling. For use mostly to plug a flue pipe opening situated at the exterior wall of a dwelling. By plugging that particular hole usually situated, leading directly out to a chimney bottom with an insulated double walled cap, the insulated cap stops heat from escaping out the hole in the wall and prevents cold air from entering the dwelling, when the heating unit is not in use. It is also effective during hot summer months, when air conditionners are in use, when used it caps hot air out and cold air in. The "Double Wall Insulated Cap" uniquely because of its double wall nature fits to all standard sized flue openings and also at any angle.

French Abstract

Le capuchon isolé à double paroi est un dispositif qui, lorsquutilisé, conservera la chaleur dans une habitation. Il sert principalement à boucher un tuyau d'évacuation situé sur la paroi extérieure dune habitation. En bouchant ce trou particulier à lendroit habituel, menant directement au bas dune cheminée, au moyen dun capuchon isolé à double paroi, le capuchon isolé empêche la chaleur de séchapper du trou dans la paroi et empêche lair froid dentrer dans lhabitation, lorsque lunité de chauffage nest pas en fonction. Il également efficace pendant les chauds mois dété, lorsque les climatiseurs sont en fonction, lorsquutilisé il envoie lair chaud à l'extérieur et laisse entrer lair froid. Le capuchon isolé à double paroi est unique parce que la nature de sa double paroi s'adapte à toutes les ouvertures de conduit de cheminée et également à tous les angles.

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


Various features of the invention are set forth in the following claim;
Claim 1: An insulation flue cap comprising:
a cylindrical metal cap, open at a first end and closed at the second end;
a center fastener;
a cover plate;
an inner metal cylinder having a smaller diameter than the cylindrical metal
cap and
located concentrically therein, the inner metal cylinder having a first end
and a second
end, the second end abutting the inside of the cylindrical metal cap;
and fire retardant insulation, the insulation located inside the inner metal
there being an open channel between the cylindrical metal cap and the inner
cylinder for accepting an open flue pipe end;
the cover plate fittingly covering the first end of the inner metal cylinder
and covering the
insulation without covering the open channel, the center fastener securing the
cover plate
and the inner metal cylinder to the cylindrical metal cap.
Claim 2: The double wall insulated cap of claim 1, further comprising a hooked
metal handle
attached at the center bolt at the closed end of the cylindrical metal cap and
outward from the center of the cylindrical metal cap.

A single figure which represents the drawing illustrating the invention.

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.

Admin Status

Title Date
(22) Filed 2014-08-07
(41) Open to Public Inspection 2015-03-16
Examination Requested 2015-07-17
(45) Issued 2017-05-30

Maintenance Fee

Description Date Amount
Last Payment 2018-07-30 $50.00
Next Payment if small entity fee 2019-08-07 $100.00
Next Payment if standard fee 2019-08-07 $200.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

  • the reinstatement fee set out in Item 7 of Schedule II of the Patent Rules;
  • the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
  • the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $400.00 2015-07-17
Filing $200.00 2015-07-17
Maintenance Fee - Application - New Act 2 2016-08-08 $50.00 2016-07-18
Final $150.00 2017-04-13
Maintenance Fee - Patent - New Act 3 2017-08-07 $250.00 2018-03-15
Maintenance Fee - Patent - New Act 4 2018-08-07 $50.00 2018-07-30

To view selected files, please enter reCAPTCHA code :

Filter Download Selected in PDF format (Zip Archive)
Number of pages Size of Image (KB)
Drawings 2016-09-19 2 25
Abstract 2015-07-17 1 18
Description 2015-07-17 4 248
Claims 2015-07-17 1 34
Drawings 2015-07-17 2 59
Representative Drawing 2015-08-18 1 12
Cover Page 2015-08-18 2 42
Drawings 2016-01-07 9 174
Description 2016-09-19 7 217
Claims 2016-09-19 2 39
Description 2017-01-09 6 215
Claims 2017-01-09 1 27
Correspondence 2015-07-23 1 144
Correspondence 2015-07-23 1 30
Prosecution-Amendment 2016-01-07 3 56
Prosecution-Amendment 2016-06-23 1 28
Prosecution-Amendment 2016-07-05 1 26
Prosecution-Amendment 2016-07-08 11 584
Fees 2016-07-18 1 48
Prosecution-Amendment 2016-09-19 11 311
Prosecution-Amendment 2016-10-20 4 276
Prosecution-Amendment 2017-01-09 7 255
Prosecution-Amendment 2017-02-15 3 195
Prosecution-Amendment 2017-03-15 2 61
Claims 2017-03-15 1 25
Correspondence 2017-04-13 1 42
Cover Page 2017-04-28 2 39
Fees 2018-03-15 1 40
Fees 2018-07-30 1 23