Room-air interceptor device
CA 2109230 C · Owner: Sauer, James F. · Inventors: Sauer, James F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stairwell (7) in a split or multi level home provides access to and air communication with lower-level (3), mid-level (9) and upper-level (11) rooms resulting, in a chimney effect of continuously drawing higher temperature and highest temperature room air from the lower-level room (3). Vertically directed downward axial fans (23) of a room-air interceptor device (1) emplaced in, the lower-level room (3) at its ceiling (21) and at its entrance (5) to the stairwell (7), not only eliminates such chimney effect but also intercepts and recirculates temperature-layered room air in the lower-level room (3) resulting from convection or gravity circulation to, dissipate such temperature-layered …
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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 June 25, 1992 and granted April 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2014.
- 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.