Expired Canadian patentCanada
Manufacture of diisocyanates
CA 1190239 A · Owner: American Cyanamid Company · Inventors: Henderson, William A. Jr.; Singh, Balwant
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for production of tertiary aralkyl isocyanates by reaction at low temperatures of the corresponding halides with an excess of isocyanic acid. Manufacture of TMXDI is specifically contemplated.
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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 July 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2002.
- 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 6, 1982
GrantedJuly 9, 1985
Term endedJuly 9, 2002
Patent numberCA 1190239 A
Classification (IPC)B01J27/10
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.