Patents by Inventor Keizi Takeda

Keizi Takeda 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).

  • Patent number: 4254214
    Abstract: A photographic material for recording non-silver images at high sensitivity using a small amount of silver halide, comprising a support, a layer, formed thereon, of a monovalent or divalent copper salt or complex and a hydrophilic binder, and a layer of silver halide formed on the layer containing the copper salt or complex either by vacuum-deposition or sputtering, or by coating a silver halide emulsion. Non-silver images are formed by exposing the photographic material imagewise, and developing the silver halide layer and the copper compound layer either successively with different developer solutions, or continuously in one developer solution. The silver developed acts as a catalyst for the development of the copper compound.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: March 3, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keizi Takeda, Kenji Matsumoto, Masayoshi Nagata