Polyhydric phenol, and epoxy resin and epoxy resin composition derived therefrom
CA 2079991 A1 · Owner: Morimoto, Takashi · Inventors: Shiomi, Yutaka; Kanagawa, Shuichi; Takebe, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel polyhydric phenol represented by the general formula:, wherein R1 to R4 independently represent hydrogen an alkyl, or cycloalkyl group having 1 to 9 carbon atoms or halogen, and X represents hydrogen, an alkyl group having 1 to 9 carbon atoms, or an aryl group, and n represents an average number of repeating units of 0.1 to 10. With the above polyhydric phenol as starting material there is provided an, epoxy resin represented by the general formula: wherein R1 to R4, X and n are as defined above. There is provided an epoxy resin composition comprising the above epoxy resin and a curing agent. The cured products from the above epoxy resin are excellent in less hygroscopicity and have …
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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 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 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.