Diphenyl acetic acid derivatives
CA 2084041 C · Owner: Nesvadba, Peter · Inventors: Nesvadba, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel diphenyl acetic acid derivatives of the formula I are described (see Formula I), in which R is C3-C18-2-alkenyl C3-C8-2-alkynyl or phenyl-C1-C4alkyl, each of which is, unsubstituted or substituted by phenyl R1 is hydrogen, C1-C18alkyl, C5-, C12cycloalkyl or phenyl-C1-C4alkyl, R2 is -OR4 or -NR5R6 R4 is hydrogen, C1-C18alkyl or (-CH2-, )n G R5, and R6 independently of one another are hydrogen C1-C12alkyl or phenyl-C1-, C4alkyl, R7 R8, R9 and R10 independently of one another are hydrogen C1-C4alkyl or C1-, C4alkoxy, with the proviso that at least one of the radicals R7 R8, R9 or R10 is , hydrogen, R11 is, hydrogen C1-C18alkoxy, C5-C8cycloalkoxy, phenyl-C1-C4alkoxy or …
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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 November 27, 1992 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 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.