Methane diphosphonic acid derivative, its production process and its pharmaceutical applications
CA 2127115 C · Owner: Takanishi, Keijiro · Inventors: Kawabe, Norio; Takanishi, Keijiro; Nakadate, Teruo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention discloses a methane diphosphonate derivative, a process for producing said derivative and its pharmaceutical applications said, methane diphosphonate derivative indicated with general formula (1):, (see fig.I), (wherein, R1 R2, R3 and R4 are independently a, pharmacologically acceptable cation a hydrogen atom or a, straight chain or branched alkyl group having 1-4 carbon atoms, R5 is a hydrogen atom or a trialkylsilyl group m is, an integer of 0 to 3, n is an integer of 1 to 3 R6 and R7, are independently a hydrogen atom or an alkyl group and X, represents a hydrogen atom, a halogen atom an alkyl group, an alkoxy group or an alkylthio group). The compounds of the …
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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 October 29, 1993 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2015.
- 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.