Expired Canadian patentCanada
Pyrylium dye salt as filter and anti-halation dye in photographic materials
CA 446001 A · Owner: General Aniline And Film Corporation · Inventors: Thomas R. Thompson
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 6, 1948. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 6, 1965.
- 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 6, 1948
Term endedJanuary 6, 1965
Patent numberCA 446001 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.