Alkyl carboxylate salts as solvents for henkel-related processes
CA 2383506 A1 · Owner: Mossi & Ghisolfi Overseas S.A. · Inventors: Brownscombe, Thomas F.; Pfrehm, Susan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is the use of one or more molten salts or a mixture thereof for use as a reaction medium in a process for the preparation of an aromatic diacid which comprises heating an alkali metal salt of an aromatic monocarboxylic acid or asymmetrical aromatic dicarboxylic acid under pressure with carbon dioxide gas in the presence of a catalyst at suitable reaction conditions. The molten salt reaction medium provides advantages in a disproportionation reaction to produce, for example, purified terephthalic acid. In another aspect of the invention, novel methylated diacids are produced.
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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
- Filed August 8, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2022.
- 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
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.