Thiophene derivatives
CA 1066711 A · Owner: Hoffmann-La Roche Limited · Inventors: Hromatka, Otto; Binder, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sulphothiophene-carboxylic acids halides and/or, lower alkyl ester thersof of general formulae , , I II III IV, wherein A together with the two carbon atoms to which it is attached forms the group or , (a) (b), and the broken line represents the double bond present in group (a), R represents a lower alkyl group and Hal represents a halogen atom, are useful as intermediates for the preparation of thienothiazine derivatives having anti-inflammatory analgesic and, antirheumatic activity.
Read the whole patent
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 November 20, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 20, 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
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.