Patents by Inventor Michitoshi Iwao

Michitoshi Iwao 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).

  • Diffusion transfer photographic materials comprising polyvinyl ether neutralizing layer
    Patent number: 4149891
    Abstract: An improved neutralization layer is disclosed for a diffusion transfer photographic material wherein said layer contains a copolymer having a monomer unit represented by the formula ##STR1## wherein A is a divalent radical selected from the group consisting of an alkylene group, an arylene group and a combination group consisting of at least one alkylene group and at least one arylene group; the alkylene group containing two or more carbon atoms; the alkylene group, the arylene group and the combination group containing at least one --COOR and/or at least one ##STR2## in which R is hydrogen or an alkyl group.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: April 17, 1979
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yuzuru Sato, Masao Asano, Michitoshi Iwao, Mikio Koyama