Patents by Inventor Kiyoyasu Hashimoto

Kiyoyasu Hashimoto 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: 5012015
    Abstract: 2,4-Dichloro-3-alkyl-6-nitrophenol, which is a precursor of 2,4-dichloro-3-alkyl-6-aminophenol useful for the production of a cyan coupler to be used with a sensitive material in the field of a photography in color, is industrially advantageously produced by (a) nitration of 2,4,5-trichloro-3-alkylbenzene, followed by hydrolysis of the resulting 2,4,5-trichloro-3-alkyl-6-nitrobenzene, or (b) hydrolysis of 2,4,5-trichloro-3-alkylbenzene-6-sulfonic acid or a salt thereof, followed by nitration of the resulting 2,4-dichloro-3-alkylphenol-6-sulfonic acid or a salt thereof, the starting material usable for these processes being 4-alkylbenzenesulfonic acid or a salt thereof, which is easily available.
    Type: Grant
    Filed: March 7, 1989
    Date of Patent: April 30, 1991
    Assignees: Daiei Chemical Co., Ltd., Sumitomo Chemical Co., Ltd.
    Inventors: Masanobu Terao, Yuzo Maegawa, Yasuyoshi Ueda, Kiyoyasu Hashimoto, Takashi Omura
  • Patent number: 4923974
    Abstract: A monoazo compound of the following formula, ##STR1## wherein X is a hydrogen or halogen atom, or a C.sub.1-4 alkyl, C.sub.1-4 alkoxy, C.sub.1-4 alkylsulfonyl, C.sub.1-4 alkylcarbonyl, C.sub.1-4 alkoxycarbonyl, nitro, cyano or trifluoromethyl group, Y is a hydrogen or chlorine atom or a methyl or acylamino group, and Z is a hydrogen or chlorine atom or a methyl, methoxy or ethoxy group, which is useful for dyeing or printing hydrophobic fibers with superior level dyeing and build-up properties to give dyed products of a brilliant color superior in fastness properties.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: May 8, 1990
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yasuyoshi Ueda, Hideo Hattori, Jun Yamamoto, Kiyoyasu Hashimoto
  • Patent number: 4833123
    Abstract: A yellow dye-donor element for thermal dye transfer and having good characteristics for ink formation, and a thermal transfer sheet made using the yellow dye-element, having adequate sublimatability or vaporizability, good coloring, with a high printing density on receiving papers, and high storage stability and light stability of printing image, and employable as a yellow color among the three primary colors are provided. The above yellow color-element comprises a yellow dye dispersed or dissolved in a polymeric binder, which is represented by the formula (I): ##STR1## wherein R.sub.1 is an alkyl group of C.sub.1 -C.sub.12, an allyl group or a crotyl group; X is hydrogen, halogen or a C.sub.1 -C.sub.4 lower alkyl or C.sub.1 -C.sub.4 lower alkoxy group; Y is a C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.7 cycloalkyl, C.sub.1 -C.sub.4 alkoxy, phenyl, tolyl, or phenoxy group; and A is --CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 O--, or --CH.sub.2 CH.sub.2 CH.sub.2 --.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: May 23, 1989
    Assignee: Sumitomo Chemical Company Limited
    Inventors: Kiyoyasu Hashimoto, Takashi Omura, Yasuyuki Suzuki, Yoshiaki Hayashi
  • Patent number: 4826505
    Abstract: A monoazo pyridone compound of the following formula, ##STR1## wherein X is a member selected from hydrogen, halogeno, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, aralkoxycarbonyl, alkylsulfonyl, arylsulfonyl, carbamoyl, sulfamoyl or cyano, and R is alkyl, alkenyl, cycloalkyl, phenyl or anilino, with the provisos that X is a member selected from those defined above except for hydrogen, chloro, methyl and methoxy when R is ethyl, and X is a member selected from those defined above except for alkyl when R is iso-butyl, which is stable under dyeing conditions, and useful for dyeing hydrophobic fiber materials to give dyed products of a deep, fast and brilliant color of greenish yellow to orange.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: May 2, 1989
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masao Nishikuri, Kiyoyasu Hashimoto, Hideo Hattori
  • Patent number: 4536569
    Abstract: A compound of the formula, ##STR1## wherein R.sup.1 is methyl or ethyl, R.sup.2 and R.sup.3 are each C.sub.5 -- or C.sub.6 --alkyl, and Z is chlorine for use as a blue disperse dye of hydrophobic fibers, either alone or as a mixed dye in combination with anthraquinone; the compound combines low cost relative to anthraquinone with superior stability in the dye bath and excellent dyeability; mixed dyes retain anthraquinone-imparted brilliance of color, have good color fastness, dyeability and reproducibility characteristics, and maintain low cost.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: August 20, 1985
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kiyoyasu Hashimoto, Kenji Yoshinaga, Yoshio Mori, Junzaburo Seino, Hirohito Kenmochi, Katsunobu Sato
  • Patent number: 4529406
    Abstract: A monoazo compound of the formula, ##STR1## wherein X is hydrogen atom or lower alkyl group; Z is hydrogen atom, halogen atom, alkyl group, acylamino group, benzoylamino group or alkylsulfonylamino group; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently are hydrogen atom or alkyl group, provided that R.sub.1, R.sub.2, R.sub.3 and R.sub.4 cannot simultaneously be hydrogen atoms; and R.sub.5 is hydrogen atom, alkyl group, substituted alkyl group, alkenyl group, cycloalkyl group, aralkyl group or phenyl group.
    Type: Grant
    Filed: July 18, 1983
    Date of Patent: July 16, 1985
    Assignee: Research Association of Dyestuff Manufacturers
    Inventors: Kiyoyasu Hashimoto, Akira Murata, Kiyoteru Kojima, Toshio Nakamatzu, Akira Takeshita
  • Patent number: 4488992
    Abstract: A disperse dye of the formula, ##STR1## wherein R.sub.1 is an alkyl group having 5 to 6 carbon atoms, R.sub.2 is an alkyl group having 5 to 6 carbon atoms, a cyano-ethyl group, R.sub.3 is a hydrogen atom or a lower alkyl, amino or phenyl group, and Y.sub.1 and Y.sub.2 represent independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, a nitro group, a cyano group, a thiocyanate group or an alkylsulfonyl group, provided that both Y.sub.1 and Y.sub.2 are not hydrogen at the same time and Y.sub.1 is located at the 4- or 5-position, which is useful for dyeing hydrophobic fibers in brilliant red to violet shade with good fastnesses.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: December 18, 1984
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kenji Yoshinaga, Kiyoyasu Hashimoto, Tetsuo Okaniwa, Hirohito Kenmochi