Bisphosphonic acid derivatives, their intermediates and bone resorption inhibitors containing them as active ingredients
CA 2060790 A1 · Owner: Hayashida, Mitsuo · Inventors: Nomiyama, Kiyoshi; Hayashida, Mitsuo; Awa, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bisphosphonic acid derivative of the formula (I) or a pharmaceutically acceptable salt thereof: (I), wherein A is, ,, or, wherein each of R1 and R2 which may be the same or, different, is a hydrogen atom a halogen atom, a C1-6, alkyl group or a single bond each of j, k and e is 0 or, a positive integer provided that (j+k+?) is from 2 to 6, each of R3 and R4 which may be the same or different, is (i) a hydrogen atom, (ii) a C1-6 alkyl group a C2-6, alkenyl group, a C2-6 alkynyl group a C1-6 alkyl-carbonyl, group, a C2-6 alkenyl-carbonyl group a C2-6 alkynyl-, carbonyl group (these groups may be substituted by at least one member selected from the group consisting of a substituted amino …
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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 February 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 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
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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.