Patents by Inventor Yuji Shirakura

Yuji Shirakura 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: 5820977
    Abstract: In a support for a photographic printing paper, in which water-proof resin layers 2, 3 are formed on both sides of a base 1, one of the water-proof resin layers 2, 3, at a side of an emulsion to be coated, contains titanium dioxide pigment. The surface of particles of the titanium dioxide pigment is treated with a silane coupling agent. Preferably, the surface of titanium dioxide is subjected to surface treatment with an inorganic surface treating agent, and subsequently, is treated with the silane coupling agent. Further, silicone oligomer is preferably used as the silane coupling agent. As a result, a support for a photographic printing paper can be provided which causes no film fractures in the water-proof resin layers and no score lines in a die-lip portion, provides excellent adhesiveness to the base, and is superior in image sharpness.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: October 13, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuji Shirakura, Hisamasa Abe
  • Patent number: 5817448
    Abstract: A silver halide photographic material comprising a support having provided thereon at least one light-sensitive silver halide emulsion layer, wherein a silver halide emulsion in said at least one light-sensitive silver halide emulsion layer is a high silver chloride emulsion having a silver chloride content of 95 mol % or more, said support comprises a resin coated paper, and a resin layer of the side on which the light-sensitive silver halide emulsion layer is provided of said resin coated paper comprises at least a titanium dioxide pigment and at least one brightening agent(s) selected from the group consisting of a bis(benzoxazolyl)naphthalene based brightening agent, a bis(benzoxazolyl)thiophene based brightening agent, a coumarin based brightening agent and a pyrazoline based brightening agent.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: October 6, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Hayashi, Yuji Shirakura
  • Patent number: 5466519
    Abstract: A support for a photographic printing paper comprising a substrate and a waterproof resin coating layers provided on the both sides of the substrate, wherein at least the waterproof resin-coating provided on the side of the substrate on which an emulsion for forming an image is coated comprises i) a lowermost waterproof resin coating layer contacting the substrate and ii) at least one upper coating layer containing a waterproof resin capable of melt-extruded at a temperature of from 170.degree. to 290.degree. C. and containing uniformly dispersed titanium dioxide, and a method for manufacturing the support by melt extrusion.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: November 14, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuji Shirakura, Hisamasa Abe, Teruo Yamashita, Tatsuo Shimizu, Sei Kawahara, Takahito Miyoshi, Yasuo Nishikawa