Expired Canadian patentCanada
Polymers based on bicyclic amide acetals/polyepoxides/polyisocyanates
CA 1250990 A · Owner: Ashland Oil, Inc. · Inventors: Goel, Anil B.; Tufts, Timothy A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel polymers having excellent physical properties including heat distortion temperatures and izod impact strengths are prepared by the interaction of bicyclic amide acetals with epoxide resins and polyisocyanates.
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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 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 29, 1985
GrantedMarch 7, 1989
Term endedMarch 7, 2006
Patent numberCA 1250990 A
Classification (IPC)C08G18/00 +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.