Expired Canadian patentCanada
Polyvinyl alcohol starch adhesive
CA 678317 A · Owner: E.I. Du Pont De Nemours And Company · Inventors: Robert L. Rusher
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 21, 1964. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 1981.
- 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 21, 1964
Term endedJanuary 21, 1981
Patent numberCA 678317 A
Classification (IPC)C08L1/00 +1 more
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.