Expired Canadian patentCanada
Process for making meta-alkyl phenols
CA 1289575 C · Owner: Brackenridge, David R. · Inventors: Brackenridge, David R.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for making meta-alkylphenols by reacting ortho-halo alkylbenzenes, e.g. ortho-chloro tert-butylbenzene, with an alkali metal base, e.g. potassium tert-butoxide.
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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 September 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2008.
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FiledApril 19, 1988
GrantedSeptember 24, 1991
Term endedSeptember 24, 2008
Patent numberCA 1289575 C
Classification (IPC)C07C37/02 +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.