Passive building vents
CA 2076959 A1 · Owner: Kolt, Stanley · Inventors: Kolt, Stanley; Kolt, Stanley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A passive building vent (10) on an outside wall (18) is, connected to an opening (25) provided in the wall (10). A housing (30) disposed between the confined air (20) and the outside air (16) forms an air mixing chamber (32). A movable membrane (35) is mounted within the housing (30) at one end of the passageway (25). The other end of the passageway (34) communicates with the confined air (20). The membrane means (35) has a closed position substantially blocking the passageway (34) and an open position permitting, the free flow of air therethrough. The membrane (35) is in its closed position when at rest. The flow of outside air (16) entering through the passageway (34) impinges upon a …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.