Bicyclic sulfonamide derivatives
CA 1278577 C · Owner: Hagishita, Sanji · Inventors: Seno, Kaoru; Narisada, Masayuki; Tsushima, Tadahiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bicyclic sulfonamido derivatives represented by the formula: wherein R1 is a hydrogen or lower alkyl; R2 is an alkyl substituted or unsubstituted aryl, aralkyl or heterocycle; R3 is a hydrogen or methyl; X is an alkylene or alkenylene which may be substituted by a fluorine atom or atoms and may contain a oxygen sulfur and/or phenylene in the chain; Y is straight or branched alkylene or alkeneylene, oxygen, or sulfur; m indicates 0 or 1; and n indicates 0, 1 or 2, or their salt being used as antithrombotic, anti-vasoconstricting, and anti-brochoconstricting drugs.
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 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2008.
- 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.