Process for the production of polycondensate containing cyclic imide groups
CA 1064643 A · Owner: Bayer Aktiengesellschaft · Inventors: Clarenz, Werner; Zecher, Wilfried; Dunwald, Willi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of polycondensates linked by cyclic imide groups, wherein at least one organic polyisocyanate or masked isocyanate, formic acid and at least one cyclic dicarboxylic acid anhydride compound which in addition, to the cyclic anhydride group is substituted at least once, by another cyclic anhydride carboxyl, carbalkoxy, carbaroxy, or SO3H group are polycondensed at temperatures in the range from 0 to 450°C.
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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 October 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 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.