Arylalkoxythiocoumarins, the preparation thereof and therapeutic composions containing these
CA 2107818 A1 · Owner: Weifenbach, Harald · Inventors: Rendenbach-Mueller, Beatrice; Weifenbach, Harald; Weifenbach, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Arylalkoxythiocoumarins of the formula, I, where, R1 and R2 are each independently of one another, hydrogen C1-C5-alkyl, trifluoromethyl, phenyl or halogen, or together are a C3-C5-alkylene chain and, X is oxygen or sulfur, R3 is C1-C5-alkyl or halogen n is an integer from 0 to 3, R4 is hydrogen or C1-C4-alkyl and Ar is phenyl, which can be mono- or disubstituted by halogen, C1-C6-alkyl, C3-C7-cycloalkyl C1-C6-alkoxy, nitro, cyano, trifluoromethyl or a combination of these substituents or is a heteraromatic ring which has from one to three heteroatoms which can in-, dependently of one another, be N, O or S and which, can be substituted by C1-C6-alkyl C3-C7-cycloalkyl, C1-C6-alkoxy, …
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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 October 6, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2015.
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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.