Expired Canadian patentCanada
Process for dearylation of alkylenebisphenols and alkyltrisphenols
CA 1310665 C · Owner: Hoechst Celanese Corporation · Inventors: Mott, Graham N.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alkylenebisphenols and alkyltrisphenols are dearylated under mild conditions of temperature and pressure in the absence of HF to obtain alkyl and/or alkenyl substitute or phenols and other related polymer products.
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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 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 25, 1988
GrantedNovember 24, 1992
Term endedNovember 24, 2009
Patent numberCA 1310665 C
Classification (IPC)C07C39/04 +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.