Patents by Inventor Hideaki Iwama

Hideaki Iwama 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).

  • Photographic element for color diffusion transfer process
    Patent number: 4304850
    Abstract: A photographic element for color diffusion transfer which includes a timing layer comprising a polymeric latex made up of (1) a conjugated diene monomer, (2) and ethylenically unsaturated acid monomer or salt, and (3) an ethylenically unsaturated monomer, which monomers are within certain percentage ranges.
    Type: Grant
    Filed: July 1, 1980
    Date of Patent: December 8, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Mikio Koyama, Satoru Ikeuchi, Noboru Mizukura, Hideaki Iwama
  • Color diffusion transfer dye mordant
    Patent number: 4234671
    Abstract: A dye image-receiving layer in a diffusion transfer image-receiving sheet comprises a novel mordant polymer which is a copolymer of 4-vinylpyridine, a monomer containing at least 2 ethylenically unsaturated groups and a monomer containing an .alpha.,.beta.-ethylenically unsaturated group. The polymer has excellent film-forming properties without the use of a solvent and does not require any film hardener.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: November 18, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hideaki Iwama, Mikio Koyama, Masao Asano, Yasuo Tsuda
  • Photographic dye mordant
    Patent number: 4193800
    Abstract: A photographic element particularly for the color diffusion transfer process having a support and an image pattern receiving layer which comprises a polymer containing at least 10 mole percent of a repeating unit of the formula: ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group; R.sub.2, R.sub.3 and R.sub.4 each represent an alkyl group, an aralkyl group, a cycloalkyl group or a cycloalkylalkyl group; and X.sup..sym. represents a monovalent anion.
    Type: Grant
    Filed: October 19, 1978
    Date of Patent: March 18, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hideaki Iwama, Mikio Koyama, Yasuo Tsuda, Masao Asano