Phenoxyacetic acid derivatives
CA 2090283 A1 · Owner: Takahashi, Kanji · Inventors: Hamanaka, Nobuyuki; Tokumoto, Hidekado; Takahashi, Kanji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
We proposed a novel compound having an activity of PGI2 receptor agonist. A phenoxyacetic acid derivative of the formula A is -C(R1)=N-OR2, -CH(R)NH-OR2, -COE, -SO2E -CH2-NR3-Y, -Z-, NR3-CONR4R5, -CH2-OR6 -CO2R6, -CH2-O-N=CR7R8, -CH2-O-NHCHR7R8 substituted by imidazolyl(methyl), pyrazolylmethyl oxazolyl(methyl), thioxazolyl, isoxazolyl isothiazolyl, oxadiazolyl, triazolylmethyl; T is alkylene, alkenylene, etc.;, D is-CO2R10,-CONR11R12; E is (substitution) amino, hydradino;, Y is substituted (thio) carbonyl substituted sulfonyl;, Z is-CH=N-, -CH2NR3-; R1, R3, R10-R13 is each H or alkyl, etc.; R2, R4-R9 is each H, alkyl or alkyl substituted by phenyl or hetero ring etc. and non-toxic salts …
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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 February 24, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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.