Novel esculetin derivatives and pharmaceutical composition
CA 2116617 C · Owner: Niimura, Koichi · Inventors: Watanabe, Koju; Niimura, Koichi; Umekawa, Kiyonori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pharmaceutical composition comprising a compound of the general formula (I):, (see formula I), wherein R1 and R2 are independently, a hydrogen atom, a, saturated or unsaturated aliphatic acyl having 2 to 25 carbon atoms or benzoyl group and R3 is a hydrogen atom or alkyl group, and a pharmaceutically acceptable carrier is disclosed. Further a novel compound of the general formula (I) wherein R1 and R2 are, independently, a hydrogen atom pivaloyl, capryloyl, lauroyl, palmitoyl stearoyl, linoleoyl, docosahexaenoyl, or benzoyl group and R3 is a hydrogen atom or, methyl group is also disclosed. The pharmaceutical, composition is useful as a chondroprotective agent for prohibiting 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 February 28, 1994 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2016.
- 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.