Plasticized polyvinyl butyral
CA 1164123 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Fowell, Peter A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TITLE, Abstract, Plasticized polyvinyl butyral compositions are disclosed. The compositions comprise polyvinyl butyral having a hydroxyl content of 15-30% by weight in compatible admixture with 10-70 parts, per 100 parts of polyvinyl butyral, of at least one propylene oxide oligomer having an average molecular weight of 300 to 2500. The compositions, especially in the form of sheeting may be used, in laminations with glass polymethyl methacrylate and, polycarbonate.
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 March 20, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 20, 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.
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.