3-phenylbenzofuran-2-ones
CA 2024217 C · Owner: Novartis Ag · Inventors: Dubs, Paul; Pitteloud, Rita
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel compounds of the formula I, (see formula I) in which R1 is C13-C30alkyl, R2 is hydrogen C1-C10alkyl, C5-C12cycloalkyl, C5-C7cycloalkyl which is substituted by C1-C4alkyl or is phenyl or C7-, C12phenylalkyl, R3 is hydrogen or C1-C4alkyl and Z is phenyl phenyl which is substituted by C1-, C8alkyl C1-C4alkoxy or chlorine, a group, (see formula I) in which n is 1 or 2 or a group, (see formula I) in which the radicals A independently of one another are C1-C8alkyl methoxy , or ethoxy, are suitable for stabilizing organic material against oxidative thermal and , actinic, degradation.
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 August 29, 1990 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 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.