Expired Canadian patentCanada
Central vacuum system wall valve
CA 2056155 C · Owner: The Hoover Company · Inventors: Houston, William S.
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 central vacuum system wall valve is described which includes a valve door capable of being pivotally cammed to open position by its interaction with the roomside hose as this hose is moved to inserted position within the wall valve.
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 November 25, 1991 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 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.
FiledNovember 25, 1991
GrantedFebruary 8, 2000
Term endedNovember 25, 2011
Patent numberCA 2056155 C
Classification (IPC)A47L9/00 +2 more
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.