Expired Canadian patentCanada
4h-1-benzopyran-4-one derivative or its salt, processes for producing the same and pharmaceutical composition comprising the same as active ingredient
CA 1320959 C · Owner: Shimotori, Tomoya · Inventors: Takano, Shuntaro; Tanaka, Keiichi; Yoshida, Chosaku
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a 4H-1-benzopyran-4one derivative represented by the formula: or a salt thereof, processes for producing the same and a pharmaceutical composition comprising the same as active ingredient.
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 August 3, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 3, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 7, 1988
GrantedAugust 3, 1993
Term endedAugust 3, 2010
Patent numberCA 1320959 C
Classification (IPC)C07D311/22 +2 more
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.