Process for the preparation of esters of aromatic carboxylic acid
CA 2205671 A1 · Owner: Hoechst Aktiengesellschaft · Inventors: Papenfuhs, Theodor; Pfirmann, Ralf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of esters of aromatic carboxylic acids The present invention relates to a process for the preparation of compounds of the formula (1), R1R2R3R4R5ArCOOR (1) in which R1, R2, R3, R4 and R5 are identical or different and are hydrogen a halogen, an alkyl or alkoxy group having 1 to 6 carbon atoms or OR NHR, NR2, SR or COOR, in which R is an alkyl radical having 1 to 4 carbon atoms, Ar is an aryl radical having 6 to 12 carbon atoms and the radical R shown in formula (1) has the above meaning by reacting a, compound of the formula (2) R1R2R3R4R5ArCOOH (2), in which R1, R2, R3 R4 and R5 are identical or different and are hydrogen a halogen, an alkyl or alkoxy group …
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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 May 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2019.
- 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.