Condensed benzene derivative
CA 2004028 C · Owner: Aotsuka, Tomoji · Inventors: Ogura, Kuniyoshi; Tanaka, Yoshiaki; Soeda, Mitsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel condensed benzene derivatives having prolyl endopeptidase inhibitory, anti-hypoxic and anti-amnesic, activities are disclosed. The compounds are represented by the following formula (I), (I), wherein A represents a methylene ethylene, or propylene, group, B represents a methylene or ethylene group m denotes, an integer of 0-5, X and Y, which may be same or different individually represent a methylene group or sulfur atom R1, represents a hydrogen atom, a carboxyl lower, alkyloxycarbonyl, hydroxymethyl or formyl group, R2, represents a hydrogen atom a halogen atom, a lower alkyl, lower alkoxy nitro, or amino group, R3 represents a hydrogen atom or a lower alkyl group, and the dotted …
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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
- Filed November 28, 1989 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 2011.
- 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.