Patents by Inventor Tamotsu Kojima

Tamotsu Kojima 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).

  • Photographic acyl acetanilide color couplers with 2,5-dioxo-1-imidazolidinyl coupling off groups
    Patent number: 3973968
    Abstract: An imagewise-exposed, light-sensitive silver halide color photographic material is developed, by use of developer, in the presence of a compound of the general formula: ##EQU1## wherein A is a residue formed by removing one of the hydrogen atoms of the active methylene group of an active methylene group-containing yellow image-forming coupler of the acyl acetanilide type; X is a hydrogen atom, or an alkyl, acyl, carboxymethyl, alkoxycarbonylmethyl, carbamylmethyl, aryl, aralkyl, nitro or amino group; and Y and Z are individually a hydrogen atom, or an alkyl, ureido, aryl, aralkyl, benzylidene, styryl, or anilino group.
    Type: Grant
    Filed: April 6, 1972
    Date of Patent: August 10, 1976
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Mitsuto Fujiwhara, Syunji Matsuo, Tamotsu Kojima