Racemization process
CA 2128522 A1 · Owner: Patil, Deepak R. · Inventors: Choudhury, Azfar A.; Kadkhodayan, Abbas; Patil, Deepak R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for racemizing an optically active carboxylic acid or, ester thereof, of formula (I), where R1 is hydrogen or C1 to , C6 linear or branched alkyl; R2 R3 and R4 are different , and are hydrogen or C1 to C6 linear or branched alkyl C1, to C6 linear or branched haloalkyl aralkyl, cycloalkyl, alkyl, substituted cycloalkyl C6 to C10 aryl, C1 to C6 linear or, branched alkoxy C6 to C10 aryloxy, C1 to C6 alkylthio, C2 to C8 cycloalkylthio C6 to C10 arylthio, C6 to, C10 arylcarbonyl C4 to C8 cycloalkenyl, trifluoromethyl halo, C4 to C5 heteroaryl, C10 to C14 aryl or biphenyl, unsubstituted or substituted with methyl or halo comprising heating, said optically active carboxylic acid or ester …
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 January 14, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2015.
- 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.