Oxalic acid derivatives, their preparation and plant growth regulators containing them
CA 2046759 A1 · Owner: Rademacher, Wilhelm · Inventors: Keil, Michael; Harreus, Albrecht; Rademacher, Wilhelm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/41753, ABSTRACT OF THE DISCLOSURE: Oxalylhydroxamic acid derivatives of the formula I, R1-ON(R2)-Co-Co-X-R3 I, where the substituents have the following meanings: X is oxygen or sulfur;, R1 is substituted or unsubstituted alkyl alkenyl or alkynyl;, substituted or unsubstituted monocyclic or polycyclic cycloalkyl or cycloalkylmethyl;, substituted or unsubstituted phenyl or phenyl-C1-C4-alkyl; R2 is hydrogen or alkyl;, R3 is substituted or unsubstituted alkyl alkenyl or alkynyl;, substituted or unsubstituted monocyclic or polycyclic cycloalkyl; substituted or unsubstituted phenyl-C1-C4-alkyl or phenoxy-C1-C4alkyl;, and their agriculturally useful salts; their manufacture; …
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 July 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2013.
- 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.