Process for the preparation of polyurea elastomers containing urethane groups
CA 2014924 C · Owner: Ruckes, Andreas · Inventors: Meiners, Hans-Joachim; Schmidt, Manfred; Boden, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the production of an optionally cellular elastomeric molded article having a compact surface and based on a polyurea elastomer containing urethane groups which is the reaction product of a) a polyisocyanate component based on a polyisocyanate of the diphenylmethane series, b) a polyol component based on a polyether polyol a, polyester polyol or mixtures thereof and c) a polyamine component containing, 1) 50 to 95% by weight based on the weight of component, c), of at least one sterically hindered aromatic diamine and, 2) 5 to 50% by weight, based on the weight of component c), of at least one compound which has a molecular weight of about …
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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
- Filed April 19, 1990 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 2012.
- 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.