Patents by Inventor Yoshihiro Takagi

Yoshihiro Takagi 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).

  • Formation of black-and-white silver-containing negative images by a diffusion transfer process
    Patent number: 4309499
    Abstract: A black-and-white negative image forming process is disclosed using a diffusion transfer type film unit. An exposed silver halide emulsion comprising internal latent image type silver halide grains which have substantially no fogging centers at their surface is processed with a composition comprising a silver halide solvent, a developing agent, a foggant, alkali and a fog promoting agent. The solvent for the silver halide characteristically possesses a solubilizing power for AgBr of from about 2.times.10.sup.-5 to 5.times.10.sup.-3 mol/l in a 0.002 molar aqueous solution.
    Type: Grant
    Filed: November 14, 1979
    Date of Patent: January 5, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Takagi, Katsumi Hayashi
  • Diffusion transfer photographic process
    Patent number: 4298677
    Abstract: A silver diffusion transfer photographic process using a silver halide photosensitive emulsion layer comprising silver iodochlorobromide or silver iodobromide wherein the iodide comprises from about 6 to 25 mole % of the halide content.
    Type: Grant
    Filed: June 9, 1980
    Date of Patent: November 3, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Takagi, Masakado Sakai