Internal mold release agent for use in polyurea rim systems
CA 2017809 C · Owner: Mobay Corporation · Inventors: Sanns, Frank Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for the production of optionally cellular, polyurea elastomer moldings by reacting a reaction mixture containing I) a polyisocyanate, II) a polyether having at least two isocyanate-reactive groups and a molecular weight of 1800 to 12,000 in which at least 50% of the isocyanate-reactive groups are primary and/or secondary amino groups, III) about 5 to 50% by weight based on the weight of, omponent (II) of a chain extender comprising a sterically hindered aromatic diamine and IV) about 1 to 20% by weight, based on the weight of components (II) and (III) of an active hydrogen-containing fatty acid ester having a molecular weight of about 500 to …
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 May 30, 1990 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 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.