Expired Canadian patentCanada
Range hood fan with atmospheric humidity sensor
CA 2081822 C · Owner: Tsang, Richard Wing Bun · Inventors: Tsang, Richard Wing Bun
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A kitchen range hood fan electrically connectable to an atmospheric humidity sensor such as a dehumidi-, stat. The fan motor is automatically activated when atmospheric humidity readings measured within a dwelling exceed a pre-set limit.
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 October 30, 1992 and granted October 4, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.
FiledOctober 30, 1992
GrantedOctober 4, 1994
Term endedOctober 30, 2012
Patent numberCA 2081822 C
Classification (IPC)F24C15/20
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.