Patents by Inventor Utaro Matsushita

Utaro Matsushita 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).

  • Process for producing 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid
    Patent number: 6452046
    Abstract: A process for producing 2,3,5,6-tetrachloro-1, 4-benzenedicarboxylic acid, comprising heating 2,3,5,6-tetrachloro-1,4-benzenedicarboxamide together with sulfuric acid exhibiting an acidity function (—Ho) of 10.27 to 14.44 in the presence of water contained in an amount smaller than a stoichiometric value of hydrolysis at 110 to 190° C. This process efficiently produces 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid which is a precursor of dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate useful as a herbicide.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: September 17, 2002
    Assignee: SDS Biotech K.K.
    Inventors: Utaro Matsushita, Kimitoshi Sano, Kenichi Komatsubara, Teruhiko Ishii
  • Process for producing 2, 3, 5, 6-tetrachloro-1, 4-benzenedicarboxylic acid
    Publication number: 20010025121
    Abstract: A process for producing 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid, comprising heating 2,3,5,6-tetrachloro-1,4-benzenedicarboxamide together with sulfuric acid exhibiting an acidity function (—Ho) of 10.27 to 14.44 in the presence of water contained in an amount smaller than a stoichiometric value of hydrolysis at 110 to 190° C. This process efficiently produces 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid which is a precursor of dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate useful as a herbicide.
    Type: Application
    Filed: February 22, 2001
    Publication date: September 27, 2001
    Applicant: SDS Biotech K.K.
    Inventors: Utaro Matsushita, Kimitoshi Sano, Kenichi Komatsubara, Teruhiko Ishii
  • Process for producing tetrafluorophthalic acid
    Patent number: 4769493
    Abstract: A process for producing tetrafluorophthalic acid is disclosed, which comprises the steps of:(a) reacting an alkali metal fluoride and at least one imide compound represented by formula (I) or (II) ##STR1## wherein X.sup.1, X.sup.2, X.sup.3, and X.sup.4, which may be the same or different, each represents a chloride atom or a bromine atom, R.sup.1 represents a monovalent organic group, and R.sup.2 represents a divalent organic group, to provide an N-substituted tetrafluorophthalimide; and(b) hydrolyzing the tetrafluorophthalimide in the presence of an acid.
    Type: Grant
    Filed: August 14, 1987
    Date of Patent: September 6, 1988
    Assignee: SDS Biotech K.K.
    Inventors: Haruaki Ito, Utaro Matsushita, Toshiaki Shimizu, Nobuo Ishikawa, Masaaki Shimizu