Antibiotic c-3 di-hydroxyphenyl substituted cephalosporin compounds, compositions and method of use thereof
CA 2046771 A1 · Owner: Okita, Takaaki · Inventors: Okita, Takaaki; Imae, Kiyoto; Kamachi, Hajime
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to new cephalosporins of the Formula, wherein, Y is N pr CH;, R1 is hydrogen a straight, branched, or cyclic lower alkyl group having up to six carbon atoms or a radical of the formula in which R3 and R4 are each independently hydrogen methyl, or ethyl, or R3 and R4 taken together with the carbon atom to which they are attached, may be a cycloalkylidene ring containing from 3 to 5 carbon atoms;, R2 is a radical selected from the group consisting of in which R5 is hydrogen or acetyl. In another aspect this invention relates to processes for the preparation of the compounds of Formula I to pharmaceutical, compositions containing at least one compound 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 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2013.
- 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.