Benzo¬ij quinolizine-2-carboxylic acid derivatives
CA 1253154 A · Owner: Tokyo Tanabe Company, Limited · Inventors: Saeki, Masaki; Yajima, Masao; Takagi, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
BENZOijQUINOLIZINE-2-CARBOXYLIC ACID DERIVATIVES ABSTRACT OF THE DISCLOSURE, Benzoijquinolizine-2-carboxylic acid derivatives of the general formula I and the salts, and their hydrates are provided:, I, wherein A is a methylene group and B is a carbonyl group when A and B are linked by a single bond or A and B unite, together to form a vinylene group when A and B are linked by a double bond, R1 is a hydrogen atom a C1-3 alkyl group, or a 2-hydroxyethyl group R2 and R3 are hydrogen atoms, methyl groups or ethyl groups and may be identical to or different from each other, R3 may be attached to the same carbon atom as R2, R4 is a methyl or ethyl group and X is, a halogen atom. The …
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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
- Granted April 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2006.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.