Process for the production or moldings of films of cross-linked polyisocyanate polyadducts and the moldings thus obtained
CA 2030478 A1 · Owner: Wagner, Joachim · Inventors: Freitag, Hans-Albrecht; Elsner, Thomas; Wagner, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
M03491, LeA 27,296, A PROCESS FOR THE PRODUCTION OF MOLDINGS OR FILMS OF CROSS-LINKED POLYISOCYANATE POLYADDUCTS AND THE MOLDINGS THUS OBTAINED ABSTRACT OF THE DISCLOSURE, The present invention is directed to a process of thermoplastically molding a specific foam composition. The composition is formed by reacting an isocyanate and a relatively low molecular weight tri or higher polyol in the presence of a blowing agent. Mo3491
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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 November 21, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 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.