Cephalosporin pyridinium derivatives
CA 2214677 A1 · Owner: Angehrn, Peter · Inventors: Page, Malcolm; Heinze-Krauss, Ingrid; Angehrn, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cephalosporin pyridinium derivatives of the general formula I (see fig.I), wherein, R1 is hydrogen, lower alkyl cycloalkyl or acetyl;, X is CH or N;, n is 0 1 or 2;, m is 0 or 1;, R2 is hydrogen, lower alkyl .omega.-hydroxy alkyl, benzyl or lower alkyl-heterocyclyl, the benzyl and the heterocyclyl group being unsubstituted or substituted with at least one of the groups amino, cyano, carboxy, halogen, hydroxy lower, alkyl, lower alkoxy or -CONR2, R being hydrogen or lower alkyl; or R2 is -CH2CONR4R5; wherein, R4 R5 are independently hydrogen, .omega.-hydroxy-alkyl phenyl, naphthyl or heterocyclyl, the phenyl naphthyl or heterocyclyl, being unsubstituted or substituted with at least one of …
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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 September 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 2019.
- 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.