3-aryloxazolidinone derivatives, process for their preparation and their use in therapy
CA 2027782 C · Owner: Rovei, Vincenzo · Inventors: Rovei, Vincenzo; Schoofs, Alain; Koenig, Jean-Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The derivatives of the formula :, (I), wherein : - R1 is H or C1-C4 alkyl;, X is an oxygen atom a methylene group or a -CH=CH-, group ; - n is 1 or 2 when X is an oxygen atom or a methylene group and is 0 or 1 when X is a -CH=CH- group ; - R3 is a C1-C4 alkyl, C3-C7 cycloalkyl phenyl, benzyl, CHF2, CF3 or CF3CF2 group ; - each of R2 and R'2 independently is a hydrogen atom or a C1-C4 alkyl, C4-C7 cycloalkyl, phenyl or benzyl group ;, - R'2 and R3 may further form together a -(CH2)3- or -(CH2)4chain ; and, - each of R4 and R'4 independently is a C1-C4 alkyl group or R4 and R'4 form together either a -(CH2)2- or -(CH2)3- chain, a -(CH2)2- or -(CH2)3- chain substituted by one or two C1-C4 …
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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 October 16, 1990 and granted April 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 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
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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.