Stable oxapenem-3-carboxylic acids as -lactamase inhibitors
CA 2000058 A1 · Owner: Pfaendler, Hans Rudolf · Inventors: Metzger, Karl G.; Haller, Ingo; Pfaendler, Hans Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pharmaceutical preparation comprising an antibiotic a pharmaceutical excipient therefor, and in addition an oxapenem-3-carboxylic acid of the formula or a pharmaceutically acceptable salt, ester or amide in which, R1 and R2 each independently is hydrogen or a pharmaceutically acceptable group having to 10 carbon atoms which is connected with the balance of the molecule via carbon-carbon single bonds, and, in which, R3, R4 and R5 each independently is a pharmaceutically acceptable group having 1 to 10 carbon atoms which is connected with the balance of the molecule via carbon-carbon single bonds. Le A 26 194
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
- Filed October 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 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.