Patents by Inventor Kensei Yoshikawa

Kensei Yoshikawa 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).

  • Patent number: 5521311
    Abstract: The present compounds represented by the formula: ##STR1## (wherein R.sup.1 is a phenyl group, a halophenyl group or a cycloalkyl group having 3 to 8 carbon atoms, R.sup.2 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R.sup.3 is a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, an alkenyl group having 3 to 5 carbon atoms or a benzyl group, or R.sup.2 and R.sup.3 are bonded together to form a 5- to 7-membered heterocycle) and salts thereof have potent anti-inflammatory, antipyretic, analgesic and anti-allergic actions with less side effects such as gastrointestinal disorders and with such a high safety as to permit long-term administration.
    Type: Grant
    Filed: August 14, 1995
    Date of Patent: May 28, 1996
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Kensei Yoshikawa, Shiuji Saito, Yohichi Shimazaki, Mariko Kashiwa, Katsuo Hatayama
  • Patent number: 5449826
    Abstract: To provide an excellent compound having anti-inflammatory, antipyretic, analgesic and antirheumatic actions.A 5-amino-2-phenoxysulfonanilide compound represented by the formula: ##STR1## and the salts thereof have potent anti-inflammatory, antipyretic, analgesic and antirheumatic actions, and therefore they are useful as anti-inflammatory, antipyretic, analgesic and antirheumatic agents.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: September 12, 1995
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Kensei Yoshikawa, Shuji Saito, Yohichi Shimazaki, Mariko Kashiwa, Katsuo Hatayama
  • Patent number: 5374764
    Abstract: 5-Aminosulfonanilide compounds represented by the formula: ##STR1## (wherein R is a hydrogen atom, a formyl group, an acetyl group, a propionyl group, an n-butyryl group, an n-valeryl group, an ethoxyoxalyl group, an n-propoxyoxalyl group, a methoxycarbonylacetyl group or a 3-ethoxycarbonylpropionyl group) have potent anti-inflammatory, antipyretic, analgesic and anti-allergic actions, and therefore they are useful as anti-inflammatory, antipyretic, analgesic and anti-allergic agents.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: December 20, 1994
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Kensei Yoshikawa, Shiuji Saito, Yohichi Shimazaki, Mariko Kashiwa, Katsuo Hatayama
  • Patent number: 4937360
    Abstract: N-substituted amide derivative represented by the formula ##STR1## wherein A is --CH(OH)-- or --C(.dbd.O)--, R.sup.1 is a hydrogen atom or an lkyl group having 1 to 3 carbon atoms, and R.sup.2 is an alkyl group having 1 to 6 carbon atoms, are disclosed. These compounds are useful for prevention and therapy for liver diseases.
    Type: Grant
    Filed: June 28, 1989
    Date of Patent: June 26, 1990
    Assignees: Taisho Pharmaceutical Co., Ltd., The Institute of Materia Medica of Chinese Academy of Medical Sciences
    Inventors: Geng-tao Liu, Liang Huang, Er-chang Rao, Jin Zhou, Yan Li, Katsuo Hatayama, Tatsuhiko Sano, Kensei Yoshikawa, Shohei Higuchi, Iwao Arai
  • Patent number: 4885367
    Abstract: Sulfonanilide compounds represented by the formula ##STR1## wherein R.sup.1 is a lower alkyl group or a trifluoromethyl group, R.sup.2 is a cycloalkylidenemethyl group, a group of the formula --A--R.sup.3 (wherein A is an oxygen atom, a sulfur atom, a sulfynyl group or a sulfinyl group and R.sup.3 is a cycloalkyl group having 5-8 carbon atoms; a cycloalkyl group having 5-8 carbon atoms substituted by one or two of a lower alkyl group, an oxo group, a hydroxyl group or a methanesulfonyloxy group, a tetrahydropyranyl group; a tetrahydrothiopyranyl group; or a 1-methyl-piperidyl group) or a group of the formula --B--R.sup.4 (wherein B is a carbonyl group, a hydroxymethylene group or a methylene group, R.sup.4 is a cycloalkyl group having 5-8 carbon atoms) and the pharmaceutically acceptable salts thereof have anti-inflammatory activity.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: December 5, 1989
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Kensei Yoshikawa, Yutaka Ohuchi, Kazuto Sekiuchi, Shiuji Saito, Katsuo Hatayama, Kaoru Sota
  • Patent number: 4557871
    Abstract: Novel styrene derivatives of the general formula ##STR1## wherein X is hydrogen or halogen, X.sup.1 is halogen, R is hydrogen or methyl, Y is hydroxymethyl, carboxyl, --COOR.sup.1 or --COR.sup.2 wherein R.sup.1 is prenyl, geranyl, farnesyl, cyclohexyl, phthalidyl, straight or branched chain alkyl having 1 to 6 carbon atoms, or said alkyl substituted with hydroxy, methoxy, pyridyl or alkanoyloxy having 2 to 16 carbon atoms, and R.sup.2 is amino, hydroxyamino mono-(or di-)alkylamino in which the alkyl moiety contains 1 or 2 carbon atoms, ethoxycarbonylmethylamino, carboxymethylamino, thiazolylamino, cyclohexylamino, pyridylamino, morpholino, N-methylpiperazino, phenylamino, phenylamino substituted with one or two of halogen, hydroxy, methyl, methoxy, trifluoromethyl or carboxyl at the phenyl ring, and the pharmaceutically acceptable salts thereof when Y is carboxyl are disclosed. These compounds exhibit high and long-lasting anti-inflammatory, analgesic and anti-pyretic activity.
    Type: Grant
    Filed: May 14, 1984
    Date of Patent: December 10, 1985
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Katsuo Hatayama, Kensei Yoshikawa, Tatsuhiko Sano, Yutaka Ohuchi, Tomomi Ota, Kazuto Sekiuchi, Kaoru Sota
  • Patent number: 4436939
    Abstract: A process for producing 1-(p-prenylphenyl)ethanol, which comprises reacting p-chloroprenylbenzene with magnesium at a temperature between 100.degree. C. and 150.degree. C. to form a Grignard reagent, and then reacting it with acetaldehyde.
    Type: Grant
    Filed: August 25, 1982
    Date of Patent: March 13, 1984
    Assignees: Taisho Pharmaceutical Co., Ltd., Kuraray Co., Ltd.
    Inventors: Takehiro Amano, Kensei Yoshikawa, Tatsuhiko Sano, Yutaka Ohuchi, Michihiro Ishiguro, Manzo Shiono, Yoshiji Fujita, Takashi Nishida
  • Patent number: 4433160
    Abstract: A process for producing an .alpha.-arylalkanoic acid ester represented by the general formula ##STR1## wherein Ar represents an aryl group which may optionally be substituted, and R.sup.1 and R.sup.2, independently from each other, represent a lower alkyl group,which comprises reacting a Grignard reagent prepared from an aryl halide of the general formulaAr--X.sup.1 (II)wherein Ar is as defined above and X.sup.1 represents a halogen atom,and magnesium, with an .alpha.-haloalkanoic acid ester of the general formula ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, and X.sup.2 represents a halogen atom,said reaction of the Grignard reagent with the .alpha.-haloalkanoic acid ester of general formula (III) being carried out in the presence of a nickel compound.
    Type: Grant
    Filed: August 25, 1982
    Date of Patent: February 21, 1984
    Assignee: Taisho Pharmaceutical Company, Ltd.
    Inventors: Takehiro Amano, Kensei Yoshikawa, Tatsuhiko Sano, Yutaka Ohuchi, Michihiro Ishiguro, Manzo Shiono, Yoshiji Fujita, Takashi Nishida
  • Patent number: 4420631
    Abstract: A novel carboxylic acid ester having the following general formula ##STR1## wherein R is alkoxyalkyl having 2 to 6 carbon atoms, cycloalkyl having 5 or 6 carbon atoms, tetrahydrofurfuryl, or alkyl having 1 to 6 carbon atoms optionally substituted with 1 or 2 hydroxyl groups, is a useful anti-inflammatory and analgesic agent.
    Type: Grant
    Filed: May 19, 1982
    Date of Patent: December 13, 1983
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Takehiro Amano, Toshihisa Ogawa, Kensei Yoshikawa, Yoshinori Shiobara, Tatsuhiko Sano, Yutaka Ohuchi, Tohru Tanami, Shoichi Ito, Jiro Sawada
  • Patent number: 4189607
    Abstract: Anilinotropone derivatives represented by the following formula: ##STR1## wherein R is hydrogen or methyl and pharmaceutically acceptable salts thereof are disclosed. They exhibit anti-inflammatory and analgesic activity with low gastrointestinal action.
    Type: Grant
    Filed: March 26, 1979
    Date of Patent: February 19, 1980
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Takehiro Amano, Kensei Yoshikawa, Jiro Sawada, Michitada Sasajima