Carboxylation of hydrocarbons to terephthalic acid or naphthalene dicarboxylic acid
CA 2383422 A1 · Owner: Brownscombe, Thomas F. · Inventors: Brownscombe, Thomas F.; Vaporciyan, Garo G.; Pfrehm, Susan S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for synthesizing aromatic acids and diacids which comprises reacting aromatic hydrocarbons with a carboxyl source selected from basic carbonate containing salts and carbon dioxide at elevated temperature under conditions in which said carboxyl source exhibits sufficient mobility to effect a net reaction to form aromatic acid salts and aromatic polyacid , salts, incorporating the aromatic hydrocarbon used in the reaction into their structure.
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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.