Expired Canadian patentCanada
Cellulose acetate washing process
CA 361575 A · Owner: Henry Dreyfus · Inventors: David Robert Johnston; John Edward Jones
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 November 3, 1936. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1953.
- 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—
GrantedNovember 3, 1936
Term endedNovember 3, 1953
Patent numberCA 361575 A
Classification (IPC)B01J8/12
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.