Aeration structure in buildings
CA 2204690 A1 · Owner: Maruyama, Noboru · Inventors: Maruyama, Noboru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aeration structure for a multi-storied building 10 having living rooms 11 in each floor; wherein an air supply hole for inletting outdoor air and an air exhaust hole are provided in a lower section and an upper section of each living room respectively and an air supply path and an air exhaust path communicated to the air supply hole and air exhaust hole of each living room, said air supply path and said air exhaust path extending in the vertical direction are, provide in each floor.
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 May 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2019.
- 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.