Expired Canadian patentCanada
Terminal check valve for force feed
CA 217641 A · Owner: William J. Schlacks · Inventors: William J. Schlacks
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 April 11, 1922. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 11, 1939.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedApril 11, 1922
Term endedApril 11, 1939
Patent numberCA 217641 A
Classification (IPC)F16N27/00 +1 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.