Patents by Inventor Keizo Kumura

Keizo Kumura 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).

  • 3(5)-hydrazinopyrazole compounds
    Patent number: 5235058
    Abstract: There is disclosed a 3(5)-hydrazinopyrazole compound represented by the following formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a hydroxyl group, an alkoxy group, or an aryloxy group, R.sub.2 represents a hydrogen atom or an acyl group, X represents an aryloxy group, an alkoxy group, a heterocyclic oxy group, or an azolyl group, M represents a hydrogen ion or a metal ion, Y represents an acid radical, and n is 0 or a positive number.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: August 10, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadahisa Sato, Keizo Kumura