Expired Canadian patentCanada
HYDROQUINONE BIS.omega.-(O-AMINOPHENYLTHIO) ALKL ETHERS AND HARDENER FOR POLYURETHANE ELASTOMER THEREOF
CA 1138475 A · Owner: Ihara Chemical Industry Co. Ltd. · Inventors: Koike, Wataro; Takayama, Masami; Yazawa, Chihiro
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydroquinone bis.omega.-(o-aminophenylthio)alkyl)ethers having the formula, wherein n is 2 or 3. The compounds are useful as hardeners for polyurethane elastomers.
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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
- Granted December 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 19, 1980
GrantedDecember 28, 1982
Term endedDecember 28, 1999
Patent numberCA 1138475 A
Classification (IPC)C07C323/36 +2 more
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.