Curable polyurethane casting systems and amine hardeners therefor
CA 2003209 C · Owner: Ciba-Geigy Ag · Inventors: Miyazaki, Teruko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An amine hardener comprising A) diethyltoluenediamine or meta-tert-butyltoluenediamine and B) a 4,4'-methylene dianiline which is substituted by , alkyl groups in at least ortho-position of each amino group and curable polyurethane casting , systems comprising said hardener and an isocyanate resin.
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 November 17, 1989 and granted September 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2011.
- 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.