Expired Canadian patentCanada
Yellow diffusion fast color formers of the benzimidozole class
CA 480702 A · Owner: General Aniline And Film Corporation · Inventors: Winfred Cornelius Craig
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 January 29, 1952. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 1969.
- 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—
GrantedJanuary 29, 1952
Term endedJanuary 29, 1969
Patent numberCA 480702 A
Classification (IPC)G03C
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.