Industrial process to manufacture aromatic carboxylic acids
CA 2186058 C · Owner: Melgosa Albillos, Miguel Angel · Inventors: Ortega Calvo, Lorenzo; Melgosa Albillos, Miguel Angel; Molina Marsans, Jorge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process that involves liquid-phase catalytic oxidation of a mono- or poly-substituted alkyl aromatic compound comprises (i) microdispersion of air in the reactor at a pressure between 15 and 25 atmospheres and at a rate between 200 and 500 kg/sec.m2; and (ii) recycling the catalyst by evaporation of the purge that contains it and leaching the resulting paste with distilled water at 20-40° C to dissolve the catalyst separating it from the rest of the components. Aromatic carboxylic acids are basic products used in a large number of industrial fields.
Read the whole patent
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 September 20, 1996 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2018.
- 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.