Air intake apparatus
CA 1280025 C · Owner: Raisanen, Niilo A.A. · Inventors: Raisanen, Niilo A.A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A feature of the present invention is a cupola having a set of upper and lower elongate openings. A pair of baffles are disposed in the cupola so as to capture rain driven in through the upper opening and subsequently divert the rain out through the lower openings. A pair of flanges are affixed to the cupola to deflect wind driven articles away from the lower openings. Air flowing into the cupola, which is mounted on a roof of a building, is directed by a duct to a counterweight valve, which is affixed in the building. The counterweight valve includes a flap which is counterbalanced by a counterweight. The flap opens and closes in response to static pressure in the building.
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
- Granted February 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 2008.
- 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.