Dibenzb,eazepin derivatives and medicaments containing these
CA 2111710 A1 · Owner: Zilch, Harald · Inventors: Zilch, Harald; Mertens, Alfred; Schafer, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
25-, Summary, The subject of the present invention are dibenzb,eazepin derivatives of the formula I (I), in which A signifies a methylene, carbonyl thio-, carbonyl, carbimino, N-hydroxycarbimino or sulphonyl group, X a valency bond or an oxygen or sulphur atom a sulphinyl or sulphonyl group, a group CH2S or a group NH, n a whole number from 1 to 3 and R1 to R4, which independently of one another can be the same or different, each a hydrogen atom, an aliphatic radical with 1 - 6 C-atoms, their tautomers, enantiomers diastereomers and physiologically compatible salts. Furthermore the invention concerns medicaments, containing compounds of the formula I especially for, the treatment of viral …
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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 June 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 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.