Cephalosporin derivatives
CA 2083345 A1 · Owner: F. Hoffmann-La Roche Ag · Inventors: Angehrn, Peter; Hebeisen, Paul; Furlenmeier, Andre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Cephalosporin derivatives of the general formula wherein Z1 and Z2 each independently signify a 6-membered aromatic ring which is substituted by two vicinal -OR1 groups (wherein R1 represents hydrogen or lower alkanoyl) which can additionally contain a further 1 or 2 O or N atoms and/or which can be substituted by halogen carboxy or, carboxy-lower alkyl, or -X-Z1 and (Q)p Z2 each independently signify a group -X1-CONR2OH or -(Q1)p-CONR2OH wherein R2 represents hydrogen, lower alkyl or phenyl; and wherein further A represents a nitrogen atom or a methine group (-CH=), X represents lower alkylene phenylene or, lower alkylene-phenylene which is optionally substituted, by carboxy and …
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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 November 19, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2014.
- 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.