Patents by Inventor Isao Hara

Isao Hara 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: 5187283
    Abstract: An indigo compound is prepared from a corresponding indole compound which is unsubstituted at the 2- and 3- positions. The indole compound and an organic hydroperoxide are reacted in the presence of a catalyst which is a metal selected from the group consisting of the metals of Groups 4, 5 and 6 of the periodic table or a compound of the metal. The reaction is conducted while taking out water from a reaction system, said water being that introduced in the reaction system or formed during the reaction, or while controlling the amount of water, which is introduced in the reaction system, at a level not greater than 1 mole per mole of the indole compound.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: February 16, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yoshihiro Yamamoto, Usaji Takaki, Shinobu Aoki, Yoshihisa Inoue, Isao Hara
  • Patent number: 5112987
    Abstract: A process for the preparation of an indigo compound which comprises reacting a corresponding indole compound having no substituent at the 2- and 3-positions with a percarboxylic acid in the presence of an alcohol solvent, or with heating over 60.degree. C. in the presence of an aprotic solvent.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: May 12, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yoshihiro Yamamoto, Usaji Takaki, Shinobu Aoki, Isao Hara
  • Patent number: 4992556
    Abstract: An indigo compound is prepared by reacting an indole compound unsubstituted at the 2- and 3-positions with an organic hydroperoxide, preferably in the presence of a metallic compound catalyst capable of catalyzing the oxidation of the carton atom at the 3-position of the indole compound, such as a compound of a metal of group 4A, 5A or 6A of the periodic table.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: February 12, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Usaji Takaki, Hiroharu Suzuki, Yoshihiro Yamamoto, Shinobu Aoki, Isao Hara
  • Patent number: 4973706
    Abstract: Disclosed is a process for preparing an indigo compound in improved yield by reacting indole or other indole compound having no substituent at the 2- and 3-positions with an organic hydroperoxide in the presence of an additive selected from the group consisting of (1) a carboxyl compound and (2) a boric acid ester compound. The yield of the indigo compound can further be increased by using a metallic compound catalyst capable of oxidizing carbon atom at the 3-position of the indole compound, such as a compound of a metal of group 4A, 5A or 6A of the periodic table.
    Type: Grant
    Filed: April 25, 1989
    Date of Patent: November 27, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Yoshihiro Yamamoto, Usaji Takaki, Shinobu Aoki, Isao Hara
  • Patent number: 4966977
    Abstract: A process for the preparation of an indigo compound by reacting an indole compound having no substituent at the 2- and 3-positions with hydrogen peroxide in a liquid phase composed of at least two separate phases including an organic phase containing the indole compound and an aqueous phase containing hydrogen peroxide, or by reacting the indole compound with hydrogen peroxide in solution in an organic solvent.
    Type: Grant
    Filed: March 16, 1989
    Date of Patent: October 30, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Usaji Takaki, Shinobu Aoki, Yoshihiro Yamamoto, Isao Hara
  • Patent number: 4908472
    Abstract: The invention relates to a process for preparing a cinnamate ester comprising forming a reaction mixture of a styrene compound, an alcohol and a catalyst in a reactor; blowing a feed gas mixture of carbon monoxide, oxygen and an inert gas into the reaction mixture through at least one feed port; collecting a discharge gas flowing from the reactor and passing the gas through a condenser to form a condensate; recirculating the condensate into the reactor; blowing into the reaction mixture through at least one feed port other than the feed port(s) for the feed gas mixture, a gas selected from the groups consisting of the discharge gas and an inert gas; and isolating the cinnamate ester from the mixture.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: March 13, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Usaji Takaki, Shinobu Aoki, Yoshihiro Yamamoto, Isao Hara
  • Patent number: 4661620
    Abstract: A cinnamate ester is prepared by reacting carbon monoxide, oxygen, and its corresponding styrene compound and alcohol in the presence of a catalyst which contains, as essential components,(a) a platinum group metal or a compound thereof;(b) a copper or iron compound; and(c) a compound of at least one metal selected from Groups 4A, 5A, 7A, 8A(the iron group only), 1B(exclusive of copper) and 2B.
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: April 28, 1987
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Usaji Takaki, Isamu Sudo, Toshio Matsuhisa, Isao Hara
  • Patent number: 4319018
    Abstract: It is disclosed that, in the process for producing polymethylene polyphenyl polycarbamates through the reaction of N-phenyl carbamate with formaldehyde or a formaldehyde-supplying substance in the presence of an acid catalyst, if the reaction is carried out in the concurrent presence of at least one compound or a mixture of at least two compounds selected from the group consisting of N-carboalkoxy (or cycloalkoxy)-2-oxa-4-aza-naphthalenes, bis(N-carboalkoxy(or cycloalkoxy)-anilino)-methanes and N,N'-dicarboalkoxy (or cycloalkoxy)aminobenzyl-anilines, the object product, polymethylene polyphenyl polycarbamate, can be obtained at a high yield.
    Type: Grant
    Filed: July 2, 1980
    Date of Patent: March 9, 1982
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Katsuharu Miyata, Seiji Hasegawa, Shinobu Aoki, Isao Hara