Expired Canadian patentCanada
Tanning of leather
CA 1234654 A · Owner: Alcan International Limited · Inventors: Randall, David J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tanning of Leather Leather is made by tanning hides and skins in a solution containing chromium to which is added reactive alumina hydrate. A high take-up of chromium and leather having improved properties are obtained.
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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 April 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 5, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 4, 1985
GrantedApril 5, 1988
Term endedApril 5, 2005
Patent numberCA 1234654 A
Classification (IPC)C14C3/06
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.