Naphthyloxazolidone derivatives
CA 2028440 C · Owner: Iwata, Hiroshi · Inventors: Nomura, Sumihiro; Nakai, Hideo; Matsumoto, Mamoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A naphthyloxazolidone derivative of the formula: wherein R1 is hydrogen atom, hydroxy group nitro group, amino group, sulfo group, aminosulfonyl group a lower, alkenyloxy group, a lower alkynyloxy group a mono or, di(lower alkyl)aminocarbonyloxy group a lower alkanoyloxy, group or a lower alkoxy group which may have a substituent selected from an aryl group, a cycloalkyl group an oxygen-, containing heteromonocyclic group hydroxy group, a lower, alkoxy group, cyano group a di(lower alkyl)amino group, aminocarbonyl group a lower alkoxycarbonyl group, a lower, alkanoyloxy group a lower alkylthio group, a lower, alkylsulfinyl group and a lower alkylsulfonyl group; R2 is hydroxy group, a lower …
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, 1990 and granted November 12, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 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.