Thermosetting resin forming composition and process for preparing same
CA 2028312 C · Owner: Tamai, Shoji · Inventors: Ohta, Masahiro; Yamaguchi, Akihiro; Yamaya, Norimasa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a composition for forming a thermosetting resin having excellent impact resistance and toughness. The composition comprises a bismaleimide compound represented by formula (I):, (I) wherein R is a hydrogen atom or methyl and an amine, compound represented by formula (II): (II), wherein X is a radical selected from the group of divalent hydrocarbons having from 1 to 10 carbon atoms hexafluorinated isopropylidene, carbonyl thio, sulfinyl, sulfonyl, oxo, and , Oor by formula (III)):, (III), wherein n is an integer of 0 to 50. Also disclosed is a process for preparing the composition.
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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 October 23, 1990 and granted March 12, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 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.