Patents by Inventor Bunji Okubo

Bunji Okubo 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: 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