Process and intermediate for the preparation of 2-hydroxy-3-sulfido-3-phenyl propanoic acids
CA 2088355 A1 · Owner: Smithkline Beecham Corporation · Inventors: Jarmas, Alvydas Alfonsas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to intermediate compounds of formula (VI) wherein: R1 is (L)a-(CH2)b-(T)c-B; a is 0 or 1; b is 3 to 14; c is 0 or 1; L and T are independently sulfur oxygen, CH=CH, C=C, or CH2; B is H, C1-4alkyl ethynyl, trifluoromethyl, isopropenyl, furanyl thienyl, cyclohexyl or phenyl, unsubstituted or monosubstituted by Br Cl, CF3, C1-4alkoxy, C1-4alkyl, methylthio or trifluoromethylthio; R2 and A are independently selected from H, CF3, C1-4alkyl, C1-4alkoxy F, Cl, Br, I, OH, NO2 or NH2; or, when R1 and A are H R2 is, (L)a-(CH2)b-(T)c-B wherein a, b c, L, T and B are as defined, above; and M is H Li, Na, K, NH4 or an organic ammonium cation and their use in a process for …
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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 July 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 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
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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.