Polyhydroxyphenol derivatives and preventive and therapeutic agents for bone and cartilage diseases containing the same
CA 2255589 A1 · Owner: Kitamura, Kazuyuki · Inventors: Kitamura, Kazuyuki; Sakai, Kunikazu; Satoh, Yusuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds useful as preventive and therapeutic agents for bone and cartilage diseases; and drug compositions containing the same. The compounds are polyhydroxyphenol derivatives of general formula (I) and quinone analogues derived therefrom (wherein R1 is alkyl optionally substituted benzyl or , optionally substituted aryl; R2 is hydrogen alkyl, alkenyl or optionally , substituted benzyl; R3 is hydrogen alkyl, alkenyl, optionally substituted benzyl, hydroxyl, alkoxy, alkenyloxy or optionally substituted benzyloxy; R4 is hydrogen, alkyl, alkenyl, optionally substituted benzyl or hydroxyl; and R5 and R6 are each independently hydrogen alkyl, alkenyl or optionally , substituted benzyl). …
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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 May 14, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 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
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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.