Patents by Inventor Takeshi Hirosa

Takeshi Hirosa 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).

  • Silver halide photographic light-sensitive materials
    Patent number: 4390618
    Abstract: A silver halide photographic light-sensitive material is described comprising a layer containing a coupler compound represented by formula (I)A--B (I)wherein A represents a residue of a compound capable of undergoing a coupling reaction with an oxidation product of an aromatic primary amine developing agent, by the removal of one hydrogen atom from the active position of said compound, and B represents a group which is released by the coupling reaction and exhibits a development accelerating function.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: June 28, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidetoshi Kobayashi, Toshirou Takahashi, Shigeo Hirano, Takeshi Hirosa, Keiichi Adachi