Chloroprene copolymers
CA 2132291 A1 · Owner: Obrecht, Werner · Inventors: Schmidt, Gudrun; Happ, Michael; Schmidt, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A b s t r a c t Chloroprene copolymers containing 1 to 40% by weight of an unsaturated carboxylic acid imide an unsaturated, carboxylic anhydride and/or an unsaturated carboxylic acid in copolymerized form have hardly any gel content and are suitable for the production of vulcanizates with improved heat resistance.
Read the whole patent
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
- Filed September 16, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 16, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 2016.
- 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.