Expired Canadian patentCanada
Polyurethane and method of making
CA 1106531 A · Owner: Goodyear Aerospace Corporation · Inventors: Slagel, Edwin C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A polyurethane, being the reaction product of a polyester or polyether polyol with 1.5 to 2.5 equivalents of polyisocyanate, 0.05 to 0.40 equivalents of water cured with a polyol having less than 800 molecular weight.
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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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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 26, 1976
GrantedAugust 4, 1981
Term endedAugust 4, 1998
Patent numberCA 1106531 A
Classification (IPC)C08G18/64 +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.