Patents by Inventor Takafumi Ishihara

Takafumi Ishihara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 2,6-Dimethyl-3N,5-disubstituted-4-(substituted phenyl)3,4-dihydropyrimidine compounds and a method for treating disorders of cardiocircular system
    Patent number: 4683234
    Abstract: N-substituted 3,4-dihydropyrimidine derivatives of the formula: ##STR1## wherein X.sup.1, X.sup.2 and X.sup.3 are the same or different and are hydrogen, nitro, halogen, cyano, trifluoromethyl, methylthio or lower alkoxy;R.sup.1 is (C.sub.1 -C.sub.13) straight or branched alkoxy, (C.sub.4 -C.sub.12) straight or branched alkenyloxy, (C.sub.5 -C.sub.8) straight or branched alkynyloxy, (C.sub.1 -C.sub.4) straight or branched alkyl, (C.sub.3 -C.sub.6) cycloalkyl,--O--(CH.sub.2).sub.n --A wherein n is 1, 2 or 3, A is cyclopropyl, cyclobutyl, cyclopentyl, or (C.sub.1 -C.sub.3) haloalkyl,--O--(CH.sub.2).sub.m --O--B wherein m is 1, 2, 3 or 4, B is (C.sub.1 -C.sub.3) alkyl, or--O--(CH.sub.2).sub.l --D wherein l is an integer from zero to 8, D is phenyl or substituted phenyl;R.sup.2 is (C.sub.1 -C.sub.12) straight or branched alkyl, (C.sub.4 -C.sub.7) straight or branched alkenyl, --(CH.sub.2).sub.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: July 28, 1987
    Assignee: Suntory Limited
    Inventors: Hidetsura Cho, Kazuo Aisaka, Fumio Sato, Takafumi Ishihara