Reaction injection molding polyurea resin composition
CA 2067563 C · Owner: Tamura, Rie · Inventors: Yamamoto, Satoshi; Ohshima, Toshiyuki; Izumo, Takaharu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyurea resin molding composition for reaction injection molding use which comprises (a) a polyoxy-alkylenepolyamine, (b) an aromatic polyamine and/or a xylylenediamine and tc) a polyisocyanate wherein, either one or both of components (a) and (b) have been modified by a Michael reaction with an unsaturated compound of the formula CH2 = C(R)-Y wherein R is H or CH3 and Y is an electron attracting group. The use of such modified polyamine(s) improves in-mold flow and green strength characteristics.
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 April 29, 1992 and granted October 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2014.
- 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.