Expired Canadian patentCanada
Recovery of silver from photographic film with high shear and caustic
CA 1305328 C · Owner: Hochberg, Jerome · Inventors: Hochberg, Jerome
Overview
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Open the CIPO recordAbstract From the Canadian patent
TITLE, Recovery of Silver from Photographic Film With High Shear and Caustic, Abstract of the Disclosure A process for the recovery of silver from exposed or unexposed photographic film using a caustic alkali solution at elevated temperatures with high shear.
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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 July 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 3, 1988
GrantedJuly 21, 1992
Term endedJuly 21, 2009
Patent numberCA 1305328 C
Classification (IPC)G03C11/24
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.