Expired Canadian patentCanada
Process of manufacturing starch solutions which when dried will produce water resistant layers, and of cold swelling starches suitable for this purpose
CA 488419 A · Owner: Naamlooze Vennootschap W. A. Scholten'S Chemische Fabrieken · Inventors: Willem Albertus Van Der Meer; Jan Lolkema
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 November 25, 1952. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 25, 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—
GrantedNovember 25, 1952
Term endedNovember 25, 1969
Patent numberCA 488419 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.