Patents by Inventor Hideharu Sone

Hideharu Sone 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 phenyl- and naphthylazo-aminonaphthol sulphonic acids
    Patent number: 4841027
    Abstract: Improvement in a process for producing an arylazo-aminonaphtholsulfonic acid represented by a free acid of the formula, ##STR1## wherein A is a phenyl or naphthyl group unsubstituted or substituted by one to four members selected from alkyl, alkoxy, phenoxy, sulfonic acid, carboxylic acid, arylamino, amino, nitro and hydroxyl groups and halogen atoms, and m is 0 or 1, which comprises reacting an aminonaphtholsulfonic acid represented by a free acid of the formula, ##STR2## wherein m is as defined above, with a dibasic acid anhydride to obtain an acylaminonaphtholsulfonic acid, coupling a diazonium compound of amine of the formula,A'--NH.sub.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: June 20, 1989
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yutaka Kayane, Takashi Omura, Yasuo Tezuka, Hideharu Sone