Cephem compounds, their production and use
CA 2054126 A1 · Owner: Tomimoto, Mitsumi · Inventors: Iwahi, Tomoyuki; Tomimoto, Mitsumi; Sendai, Michiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cephem compounds Their Production and Use, A novel compound of the formula: wherein R1 stands for a C13 alkyl group R2 stands for a, C3-5 alkyl group branched at .alpha.-position or a C3-5 cycloalkyl group, or a salt thereof, being useful as a therapeutic drug for bacterial infection and the like.
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 October 24, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2013.
- 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.