Expired Canadian patentCanada
Polyvinyl butyral plasticized with tetraethyleneglycol di-n-heptanoate
CA 1162675 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Phillips, Thomas R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyvinyl butyral plasticized with tetraethyleneglycol di-n-heptanoate.
Read 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 February 21, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 21, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 28, 1980
GrantedFebruary 21, 1984
Term endedFebruary 21, 2001
Patent numberCA 1162675 A
Classification (IPC)C08L29/14 +2 more
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.