Block copolymer grafting process
CA 1300301 C · Owner: Shell Canada Limited · Inventors: Conway, Michael Francis; Willis, Carl Lesley; Martin, Michael Kent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of an elastomeric polymer containing a functional group by, a) contacting an elastomeric polymer comprising an active group containing an alkali metal atom with a steric hindering compound, b) reacting the product from (a) with CO2 or a silanol and, c) recovering an elastomeric polymer containing a carboxyl or silanol group. T2.K4668
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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 May 5, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 2009.
- 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.