Organosilicone polymers and polyester urethane foam produced therewith
CA 1047044 A · Owner: Union Carbide Corporation · Inventors: Kanner, Bernard; Prokai, Bela
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Organosilicone polymers are provided containing monofunctional units (R)3SiO1/2 and reoccurring difunctional units (R)(Q)SiO2/2 and (R)(E)SiO2/2, as essentially the sole types of units or in combination with reoccurring difunctional dialkylsiloxy units, R2SiO2/2, where R of said units is alkyl, Q is -O-R°-CN or -R°-CN, R° being bivalent alkylene,and E is a polyoxyalkylene block at least 75 weight, percent of the oxyalkylene content of the polymers being constituted of oxethylene and the mole ratio of the (R)3SiO1/2:(R)2SiO2/2:(R)(Q)SiO2/2:(R)(E)SiO2/2 units being about 2:0-20:2-20:2-30, provided the combined weight of said units is constituted, on the average, of from about 50 to about 85 …
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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 January 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 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.