2.beta.-SUBSTITUTED-METHYL-PENICILLANIC ACID DERIVATIVES, AND SALTS AND ESTERS THEREOF
CA 1299566 C · Owner: Nakai, Akira · Inventors: Tanaka, Hideo; Ohbayashi, Hisashi; Nakai, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are 2.beta.-substituted-methylpenicillanic acid compounds of the formula, (I), wherein n is 0 1 or.2; and , is monocyclic or, bicyclic heterocyclic ring group which has 2 to 4 nitrogen atoms as hetero atom in its ring structure and which may be optionally substituted with alkyl, alkoxycarbonyl phenyl, formyl or benzyloxycarbonyl optionally having alkyl, nitro or a halogen atom on the benzene ring with, the proviso that said heterocyclic ring group is not 1,2,3-triazol-1-yl; or salts or esters thereof. These compounds are useful as .beta.-lactamase inhibitor.
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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 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 28, 2009.
- 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.