Benzo (4,5) cyclohepta-(1,2,-b) thiophene derivatives
CA 1069509 A · Owner: Sandoz Ltd. · Inventors: Bastian, Jean-Michel; Berthold, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides new compounds of formula I, I, wherein n is a whole number from 1 to 3 R1 is hydrogen, or halogen of atomic number from 9 to 35, each of the two radicals R2 are the same and each is hydrogen or alkyl of 1 to 4 carbon atoms, each of tho two radicals R3 are tho same and each is hydrogen or alkyl of 1 to 4 carbon atoms, and, X is carbonyl or methylene useful as anti-arrhythmics.
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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.