Patents by Inventor Masahiko Murayama

Masahiko Murayama 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: 5705632
    Abstract: A process for the preparation of a cellulose acetate film comprises the steps of: cooling a mixture of cellulose acetate and an organic solvent to -100.degree. to -10.degree. C.; warming the cooled mixture to 0.degree. to 50.degree. C. to dissolve the cellulose acetate in the organic solvent; casting the obtained solution on a support; and evaporating the organic solvent to form the cellulose acetate film. The cellulose acetate has an average acetic acid content in the range of 58.0 to 62.5%. The organic solvent is acetone.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: January 6, 1998
    Assignees: Fuji Photo Film Co., Ltd., Daicel Chemical Industries, Ltd.
    Inventors: Kazuhiro Shimoda, Masahiko Murayama, Hidekazu Yamazaki, Tohru Shibata, Shu Shimamoto, Hiroyuki Takemoto, Naoto Habu
  • Patent number: 5663310
    Abstract: A cellulose acetate solution has cellulose acetate in a solvent. The cellulose acetate has an average acetic acid content in the range of 58.0 to 62.5%. In the first embodiment of the invention, the solvent is a mixture of acetone and another organic solvent. The organic solvent is an ether having 3 to 12 carbon atoms, a ketone having 4 to 12 carbon atom, an ester having 3 to 12 carbon atoms, or an alcohol having 1 to 6 carbon atoms. In the second embodiment, the solvent is the ether, the ketone or the ester. Processes for the preparation of the solution and a cellulose acetate film are also disclosed.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: September 2, 1997
    Assignees: Fuji Photo Film Co., Ltd., Daicel Chemical Industries, Ltd.
    Inventors: Kazuhiro Shimoda, Masahiko Murayama, Hidekazu Yamazaki, Tohru Shibata, Shu Shimamoto, Hiroyuki Takemoto, Naoto Habu
  • Patent number: 5496691
    Abstract: A process for producing a silver halide photographic material comprising a polyester support having thereon at least one light-sensitive layer and at least one undercoat layer is described, wherein the undercoat layer is provided by coating a solution containing gelatin for an undercoating binder having a calcium ion (Ca.sup.++) content of from 10 to 2,500 ppm based on dry gelatin.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: March 5, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hajime Miyamoto, Masahiko Murayama
  • Patent number: 5326689
    Abstract: A photographic material which exhibits excellent dynamic properties and little curl is provided. The silver halide photographic material comprises at least one light-sensitive layer on a polyester support, wherein the polyester support is a polyester support having a glass transition temperature of 90.degree. C. to 200 .degree. C. and is subject to glow discharge treatment. The polyester support is preferably subjected to post heat treatment at a temperature ranging from 50 .degree. C. to lower than the glass transition temperature of said polyester support after the glow discharge treatment.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: July 5, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Masahiko Murayama