Process for the preparation of hydroxyphenylpropionic acid esters
CA 2033846 A1 · Owner: Dubs, Paul · Inventors: Major, Arpad; Rusek, Milos; Mazour, Zdenek
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A-17912/17913/+, Process for the preparation of hydroxyphenylpropionic acid esters Abstract of the disclosure, A process for the preparation of compounds of the general formula (I), where, R1 and R2 are identical or different and are hydrogen C1-C18alkyl, phenyl, C1-C4alkyl-substituted phenyl C7-C9phenylalkyl, C5-C12cycloalkyl or, C1-C4alkyl-substituted C5-C12cycloalkyl R3 is hydrogen or methyl, m is 0, 1, 2 or 3 and, n is a number from 1 to 4 or 6, and A is as defined in the description, by reacting a compound of the formula II (II), where m, R1 and R2 are as defined above with a compound of the formula III, (III) where A and n are as defined in the description which comprisies carrying …
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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 January 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 2013.
- 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.