Expired Canadian patentCanada
Sulphofluorides containing azo dyestuffs
CA 468898 A · Owner: American Cyanamid Company · Inventors: Corris Mabelle Hofmann; Robert Prescott Parker; Hans Zacharias Lecher
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 October 24, 1950. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 24, 1967.
- 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—
GrantedOctober 24, 1950
Term endedOctober 24, 1967
Patent numberCA 468898 A
Classification (IPC)C09B27/00 +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.