Expired Canadian patentCanada
Process for preparing a substituted diphenoxybenzene
CA 1134866 A · Owner: Gulf Research & Development Company · Inventors: Pellegrini, John P. Jr.
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 diaminophenoxy or a dinitrophenoxybenzene is prepared in good yield from dibromobenzene and an alkali metal salt of meta-aminophenol or meta-nitrophenol under Ullmann ether synthesis conditions at low temperatures of 115°C. to 150°C.
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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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 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.
FiledSeptember 26, 1979
GrantedNovember 2, 1982
Term endedNovember 2, 1999
Patent numberCA 1134866 A
Classification (IPC)C07C211/00 +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.