Patents by Inventor Shigeji Baba

Shigeji Baba 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).

  • Light-sensitive silver halide photographic material
    Patent number: 4042400
    Abstract: A light-sensitive silver halide photographic material spectrally sensitized with at least one compound of the formula ##STR1## and at least one compound of the formula ##STR2## wherein Q.sub.1, Q.sub.2, Q.sub.3 and Q.sub.4 are individually a non-metal atom grouping necessary to complete an unsubstituted or alkyl-, alkoxyl-, phenyl-, hydroxyl-, carboxyl- or halogen-substituted benzene ring, or a non-metal atom grouping necessary to complete a naphthalene ring; Z is a sulfur or selenium atom; n.sub.1, n.sub.2, n.sub.3 and n.sub.4 are individually 2, 3 or 4; M.sub.1 and M.sub.2 are individually a hydrogen atom, an alkali metal atom or H-Q where Q is an organic base.
    Type: Grant
    Filed: January 12, 1976
    Date of Patent: August 16, 1977
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Shigeji Baba, Bunji Okubo, Eiichi Sakamoto
  • Lithographic developing process utilizing a silver halide photographic material containing hydroimidazo-s-triazine and polyalkylene oxide derivative
    Patent number: 3969117
    Abstract: A lith-type light-sensitive silver halide photographic material which gives a hard tone and sharp dot image contains in the emulsion layer or one of the layers adjacent thereto a hydroimidazo-s-triazine compound and a polyalkylene oxide derivative.
    Type: Grant
    Filed: June 11, 1974
    Date of Patent: July 13, 1976
    Inventors: Hidemaru Sakai, Shigeji Baba