Derivatives of p-substituted phenyl ester of pivalic acid
CA 1340191 C · Owner: Imaki, Katsuhiro · Inventors: Arai, Yoshinobu; Okegawa, Tadao; Imaki, Katsuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A derivative of general formula:, wherein Y is -SO2- or (i) R1 and R2 each represents, same or different (1) -H, (2) C1-16, alkyl or (3) the formula: wherein X is single-bond, -SO2-, C1-4 alkylene C1-4 alkylene, substituted by -COOH or is carbocyclic or heterocyclic ring, n is 1 ~ 5 R4 is -H or, C1-8 alkyl, C1-14 alkoxy, C1-6 alkylthio -OH, halogen, -NO2 or, trihalomethyl, the formula: -NR41R42 wherein R41 and R42 each represents halogen or C1-4 alkyl, tetrazole -SO3H or -CH2OH, the formula:-SO2NR41R42 the formula: -Z41-COOR43 wherein Z41 is single-bond, C1-4 alkylene or C2-4 alkenylene R43 is -H, C1-4 alkyl or, benzyl, the formula: -CONR41R42 the formula:-COO-Z42-COOR43 wherein Z42 is …
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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
- Granted December 15, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2015.
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