Ammonium and phosphonium salts
CA 2082994 A1 · Owner: Wolfgang, Wehner · Inventors: Reinhardt, Grade; Wolfgang, Wehner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New compounds of formula (I), R13YR2+nXn- (I) are described in which Y stands for a phosphorus or nitrogen atom n, indicates a number from 1-4 and corresponds to the valence of the anion Xn-, the residues R1 are the same or different and in the case where Y = N, indicate C2-C4-alkyl or benzyl and in the case where Y = P, have the, meaning C3-C4 alkyl phenyl or cyclohexyl, R2 represents C10-C14 alkyl and Xn- indicates one of the anions (a)1- (Hb)1-, (b)2-, (H2c)1-, (Hc)2-, (c)3, (H3d)1- (H2d)2-, (Hd)3- or (d)4-, whereby, (a)1- indicates nitrate cyanate, rhodanide, periodate, perchlorate tetraphenyl borate, salicylate, thiosalicylate O,O-di-C3-C8 alkyl, dithiophosphate, C1-C8 alkyl …
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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 16, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 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.