Expired Canadian patentCanada
Process of forming uniformly substituted amino derivatives of glucopyranose polymers and products thereof
CA 500925 A · Owner: The Keever Starch Company · Inventors: Esther P. Lasure; Kenneth M. Gaver; Levi M. Thomas
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 March 23, 1954. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 23, 1971.
- 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—
GrantedMarch 23, 1954
Term endedMarch 23, 1971
Patent numberCA 500925 A
Classification (IPC)C08B
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.