Patents by Inventor Kazuhiro Shirasu

Kazuhiro Shirasu 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 material and method for forming super high contrast images therewith
    Patent number: 4965170
    Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, said emulsion layer or at least one of other hydrophilic colloid layers containing a compound represented by formula (I):PWR--Time--.sub.T LA (I)wherein PWR represents a group which undergoes reduction to release (Time).sub.t LA; Time represents a group which release LA upon reaction following release of (Time).sub.t LA from PWR; t represents an integer of 0 or 1; and LA represents a group having a maximum light absorption in a wavelength range of 310 nm or more.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: October 23, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshinao Ukai, Kazuhiro Shirasu, Koki Nakamura, Keizo Koya, Masahiro Okada, Kazunobu Katoh