Process for preparing an ester derivative of a dihydric phenol
CA 1263403 C · Owner: Amoco Corporation · Inventors: See, Benito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described herein is an improved process for preparing an ester derivative of a dihydric phenol by reacting the dihydric phenol with an acid anhydride wherein the improvement comprises carrying out the reaction in the presence of a particular adsorbent. Also described herein is a method of treating an ester derivative of a dihydric phenol with a particular adsorbent. S P E C I F I C A T I O N
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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 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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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.