Patents by Inventor Katsuyuki Arasawa

Katsuyuki Arasawa 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: 5989801
    Abstract: The present invention provides a silver halide photographic material and an image forming method for obtaining a monochrome image using a dye image even if it is treated with a color developer free of benzyl alcohol; a photographic property of the monochrome image is less deteriorated by a toxic gas such as formaldehyde and an increase in sensitization and fog with time is improved.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: November 23, 1999
    Assignee: Oriental Photo Industrial Co., Ltd.
    Inventors: Toshio Hirosawa, Kouji Katsube, Toshiko Nakamura, Yoshiro Hayafuchi, Katsuyuki Arasawa
  • Patent number: 5939247
    Abstract: The present invention provides a silver halide photographic material which can give a black-and-white picture by the use of dye images even when processed with a color developer substantially free from benzyl alcohol, and little suffers from the deterioration of photographic characteristics by harmful gas such as formaldehyde; and a process for forming images.Specifically, a silver halide photographic material comprising a base and at least one silver halide emulsion layer formed on the base, wherein the silver chloride content of the grainy silver halide constituting the silver halide emulsion layer is 95 mole % or above; the silver halide emulsion layer contains a yellow coupler, a magenta coupler and a cyan coupler; and the silver halide emulsion layer and/or other hydrophilic colloid layer contains a specific compound; and a process for forming images which comprises processing this silver halide photographic material with a color developer substantially free from benzyl alcohol.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: August 17, 1999
    Assignee: Oriental Photo Industrial Co., Ltd.
    Inventors: Toshio Hirosawa, Kouji Katsube, Toshiko Nakamura, Yoshiro Hayafuchi, Katsuyuki Arasawa, Junichi Komiyama, Tsuyoshi Fujita, Noboru Sonda