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Expired Canadian patentCanada

Low-cost surfactant compositions for high resiliency flexible foam

CA 1192350 A · Owner: Basf Wyandotte Corporation · Inventors: Mcbrayer, Robert L.; Pray, Edward R.; Demou, John G.

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Abstract of the Disclosure, The method for improving cell structure with little or no shrinkage or foam collapse in molded high resilience open celled flexible polyurethane foams prepared by the reaction of an organic polyol having a hydroxyl functionality of at least 2 with an organic polyisocyanate in the presence of a blowing agent. This method comprises incorporating with the reactants three cell modifiers consisting of a polysiloxane-polyoxyalkylene copolymer a, polymethylsiloxane, and a polyether polyol cell modifier containing polyoxyethylene groups in amount of at least about 80 percent by weight of said polyether polyol.

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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 20, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2002.
  • 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 3, 1982
GrantedAugust 20, 1985
Term endedAugust 20, 2002
Patent numberCA 1192350 A
Classification (IPC)C08G18/61 +2 more

Timeline

Timeline From CIPO dates

1983198519871989199119931995199719992001Application filedAug 3, 1982Patent grantedAug 20, 1985Term endedAug 20, 2002

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.