Antitumor composition
CA 2025857 A1 · Owner: Sakaue, Takahiro · Inventors: Ohmori, Shinji; Ogata, Kazumi; Sakaue, Takahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Antitumor composition ABSTRACT OF THE INVENTION, The present invention relates to a useful antitumor composition comprising a compound of the formula:, (wherein R's are the same or different and each means a hydrogen atom or a lower alkyl group) or a pharmaceutically acceptable salt thereof 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 September 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2012.
- 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.