4-desoxy-epipodophyllotoxin derivative or pharmaceutically acceptable salt thereof
CA 2078662 C · Owner: Kobunai, Takashi · Inventors: Fujimoto, Katsuhiko; Takeda, Setsuo; Terada, Tadafumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A 4-desoxy-4-epipodophyllotoxin derivative of the following formula, (see above formula I) wherein R and R1 are as defined in the specification or a pharmaceutically acceptable salt thereof as well as an antitumor composition comprising such derivative or salt as an active ingredient.
Read the whole patent
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 January 22, 1992 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 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.