4-acylaminobenzopyrans
CA 1250850 A · Owner: Beecham Group P.L.C. · Inventors: Evans, John M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I):, (I) wherein:, either one of R1 and R2 is hydrogen and the other is selected from the class of C1-6 alkylcarbonyl C1-6 alkoxycarbonyl, C1-6 alkylcarbonyloxy C1-6 alkylhydroxymethyl, nitro, cyano, chloro trifluoromethyl, C1-6 alkylsulphinyl, C1-6 alkylsulphonyl C1-6 alkoxysulphinyl, C1-6 aikoxysulphonyl C1-6 alkylcarbonylamino, C1-6 alkoxycarbonylamino C1-6 alkyl-thiocarbonyl, C1-6 alkoxy-thiocarbonyl C1-6 alkyl-thiocarbonyloxy, C1-6 alkyl-thiolmethyl formyl or aminosulphinyl, aminosulphonyl or aminocarbonyl the amino moiety being, optionally substituted by one or two C1-6 alkyl groups or C1-6 alkylsulphinylamino, C1-6 alkylsulphonylamino C1-6 alkoxysulphinylamino …
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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
- Granted March 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 2006.
- 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.