Carbon black loaded polyurethane having a diene backbone
CA 1056088 A · Owner: Goodyear Tire And Rubber Company (The) · Inventors: Beyersdorff, Leland E.; Hillegass, Donald V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure This invention provides a method of making a carbon black loaded polyurethane having a diene backbone that passes the Goodrich Flex test and has a crescent tear of at least 200 pounds per inch. This polyurethane is obtained by mixing a carbon black into the hydroxyl terminated diene polymer or copolymer containing glycol and then reacting with an isocyanate at an Rv ratio of 1.25 + 0.1 and at a hydroxyl polymer to glycol ratio in the range of 2.5 to 1Ø
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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 June 5, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 5, 1996.
- 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.