Expired Canadian patentCanada
Azo amide compounds
CA 1323624 C · Owner: Miyagawa, Tsutomu · Inventors: Shiraki, Kazuo; Miyagawa, Tsutomu
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An azo amide compound of ?-N-C(CH3)2-CO- NH-R2 or a hydrate thereof or an acid-addition salt thereof, wherein R is -CH2CH=CH2, etc. is useful as a functional polymerization initiator for polymerizing acrylonitrile, etc.
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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 October 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 26, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 26, 1989
GrantedOctober 26, 1993
Term endedOctober 26, 2010
Patent numberCA 1323624 C
Classification (IPC)C07C245/04 +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.