2-lower alkyl-2,3-dihydro-5-benzofuranyl esters of lower alkyl sulfonic acids
CA 1068288 A · Owner: Fisons Limited · Inventors: Harris, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula, I or derivatives thereof, in which R1 and R2 may be the same or different and each is selected from hydrogen or an alkyl group preferably methy ethyl, or propyl) or R1 and R2 together form an alkylene chain; M is an alkyl group (preferably methyl, ethyl or propyl); R4 R5 and R6 may, be the same or different and each is selected from hydrogen an, alkyl or an alkoxy group or a halogen atom (preferably R4 R5 and, R6 are all hydrogen); and R3 is hydrogen or a group R7SO2- wherein R7 is an alkyl group (notably methyl, ethyl or propyl) are prepared by reacting the analogous compound where -OM is -NR10R11 wherein K10 and R11 may be the same or different and each is …
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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 December 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 18, 1996.
- 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.