Patents by Inventor Hiroshige Tomita

Hiroshige Tomita 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 purification of phenylhydrazine
    Patent number: 4352941
    Abstract: Crude phenylhydrazine is distilled in the presence of a glycol to obtain phenylhydrazine of high purity in a high yield.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: October 5, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shinichi Hasegawa, Yuji Ueda, Hiroshige Tomita
  • Process for producing sulfonylamides
    Patent number: 3956385
    Abstract: Sulfonylamide derivatives of the formula,RSO.sub.2 NHC.sub.2 H.sub.4 Clwherein R is an alkyl or a phenyl group, which are particularly useful for the production of photographic chemicals, are prepared by the reaction between a sulfonylhalide of the formula,RSO.sub.2 Xwherein R is as defined above, and X is chlorine or bromine, and 2-chloroethylamine or its salt, which is prepared by the chlorination of monoethanolamine with thionylchloride.
    Type: Grant
    Filed: April 16, 1974
    Date of Patent: May 11, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Hideaki Suda, Tatsuo Kanda, Hiroshige Tomita, Hirotoshi Nakanishi, Hiromu Hida, Tatsumi Nuno, Seiichi Akutsu, Masayuki Maeyashiki