7-alkylidene-3-substituted-3-cephem-4-carboxylates as beta-lactamase inhibitors
CA 2454413 A1 · Owner: Buynak, John D. · Inventors: Buynak, John D.; Vogeti, Lakshminarayana
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides compounds of formula (I): wherein: R1-R4 and A have any of the values defined in the specification and their pharmaceutically , acceptable salts are useful for inhibiting .beta.-lactamase enzymes for , enhancing the activity of .beta.-lactam antibiotics and for treating .beta.-, lactam resistant bacterial infections in a mammal. The invention also provides pharmaceutical compositions, processes for preparing compounds of formula (I) and intermediates useful for the synthesis of compounds of formula (I).
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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 July 24, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 24, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2024.
- 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.