Patents by Inventor Hirokazu Murata

Hirokazu Murata 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 preparing aromatic amide compound
    Patent number: 5675036
    Abstract: 3-?4-(4-Phenyl-1-butoxy)benzoyl!amino-2-hydroxyacetophenone is prepared by reacting a benzoate ester with a halobutylbenzene in the presence of a basic compound and an aprotic polar compound in an aromatic hydrocarbon solvent to obtain a corresponding ether, alkali hydrolyzing the ether in an aromatic hydrocarbon solvent and precipitating a hydrolysate with an acid to obtain 4-(4-phenyl-1-butoxy)benzoic acid, reacting a halogenating agent with this benzoic acid derivative in an aromatic hydrocarbon solvent to obtain an acid halide, and reacting the acid halide in an aromatic hydrocarbon solvent with a corresponding aromatic amine.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: October 7, 1997
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Etsuko Fukuda, Atsushi Furutani, Hideki Ushio, Hirokazu Murata
  • Method for the purification of 4,4'-diamino-diphenylmethane
    Patent number: 5312989
    Abstract: A method of purifying 4,4'-diaminodiphenylmethane comprising partially melting a crystal of crude 4,4'-diaminodiphenylmethane and removing a melt to obtain a high purity 4,4'-diaminodiphenylmethane. By utilizing the method, a high purity 4,4'-diaminodiphenylmethane is obtained efficiently with a low level of energy consumption.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: May 17, 1994
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Takahiro Yamamoto, Hirokazu Murata, Kiichi Hattori