Patents by Inventor Shigehisa Tamagawa

Shigehisa Tamagawa 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).

  • Heat-sensitive recording paper
    Patent number: 4803191
    Abstract: A novel heat-sensitive recording paper is provided which comprises a paper support having thereon a heat-sensitive color forming layer, wherein the paper support is made of a base paper which is 7% or less in the sum of fluctuations in uneven formation in a wavelength range of 12.5 to 80 mm as determined by means of a laser formation measuring apparatus.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: February 7, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Heat-sensitive recording paper
    Patent number: 4800192
    Abstract: A heat-sensitive recording paper is disclosed. The paper comprises a paper support having provided thereon a heat-sensitive color-forming layer wherein said paper support has at least 10 wt % of a white pigment contained in its interior and which also contains a polymer latex with an MFT (minimum film-forming temperature) of no higher than 40.degree. C. in an amount of from 5 to 30 wt % based on the weight of the white pigment.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: January 24, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Heat-sensitive recording sheet
    Patent number: 4791093
    Abstract: A heat-sensitive recording sheet comprising a paper support having provided thereon a heat-sensitive coupling layer, said paper support having an intermediate layer containing at least one white pigment disposed on a base paper comprising a mixture of synthetic pulp and natural pulp. The heat-sensitive recording sheet has increased contact with a thermal head, a high recorded density and good dot reproducibility.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: December 13, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Kazuyuki Koike, Tetsuro Fuchizawa
  • Heat-sensitive recording paper
    Patent number: 4771031
    Abstract: A heat-sensitive recording paper comprising a support having coated thereon a heat-sensitive color-forming layer, wherein the support contains an inorganic fiber.
    Type: Grant
    Filed: November 20, 1986
    Date of Patent: September 13, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Heat-sensitive recording paper
    Patent number: 4762816
    Abstract: A heat-sensitive recording paper is disclosed, comprising a paper support with a heat-sensitive color forming layer provided thereon, wherein the paper support has an internal bonding force of from 0.5 to 2.0 kg.multidot.cm and a cobb water absorption of 10 to 20 g/m.sup.2. This recording paper avoids problems of sticking and piling, and is very suitable for use in high speed recording.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: August 9, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Heat-sensitive recording paper
    Patent number: 4749678
    Abstract: A heat-sensitive recording paper is described, comprising a paper support having formed thereon a heat-sensitive color forming layer, wherein said paper support is subjected to surface sizing with a synthetic sizing agent so as to have a Cobb-water absorption degree as defined by JIS-P-8140 of 25 g/m.sup.2 or less.
    Type: Grant
    Filed: February 3, 1986
    Date of Patent: June 7, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Photographic polyolefin coated paper
    Patent number: 4705746
    Abstract: A photographic paper comprising a paper sheet coated on each side with a polyolefin resin layer and a photographic emulsion layer provided on the polyolefin resin layer on the front side, which is characterized in that the polyolefin resin layer on the back side is provided with a antistatic coating layer comprising (a) a latex which contains an alkyldiphenylether sulfonate or a formalin condensate of naphthalenesulfonate, (b) colloidal silica, and (c) an alkaline salt aluminate.
    Type: Grant
    Filed: April 15, 1986
    Date of Patent: November 10, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Heat-sensitive recording paper
    Patent number: 4686546
    Abstract: A heat-sensitive recording paper comprising a support having provided thereon a heat-sensitive recording layer, wherein an intermediate layer comprising at least one of an organic and inorganic pigment having an oil absorption property (JIS K-5101) of at least 30 ml/100 g and less than 50 ml/100 g is interposed between the support and the heat-sensitive recording paper. The heat-sensitive recording paper does not suffer from reduction in color density even when recording is effected with high energy.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: August 11, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuyuki Koike, Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Heat-sensitive recording paper
    Patent number: 4682191
    Abstract: A heat-sensitive recording paper is described, comprising a paper support having thereon a heat-sensitive color forming layer, wherein said paper support contains at least 10% by weight of a pigment and has an internal bonding strength as defined by Tappi-RC-308 of from 0.5 to 2.5 kg.cm.
    Type: Grant
    Filed: February 5, 1986
    Date of Patent: July 21, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Photographic printing paper support
    Patent number: 4678742
    Abstract: A photographic printing paper support is described, comprising a base paper having a polyolefin layer formed on both surfaces thereof, said support having provided on a back surface thereof a writing property providing layer composed of (a) inorganic pigment having an average particle diameter from 0.1 to 2.0 .mu.m and oil absorption degree of 100 cc/100 g or less, and (b) an acrylic emulsion having a glass transition point of from 20.degree. C. to 50.degree. C.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: July 7, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa, Hisamasa Abe
  • Process for making a photographic support
    Patent number: 4659430
    Abstract: A photographic support comprising a paper sheet coated with a polyolefin on both surfaces thereof, in which the paper sheet contains a water-soluble aluminum salt, an unreactive sizing agent, a reactive sizing agent, and optionally a polyamide-polyamine-epichlorohydrin resin, which is particularly resistant to edge soiling.
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: April 21, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Support for photographic paper
    Patent number: 4614688
    Abstract: A photographic paper support having superior moisture resistance and graphic properties is provided. The support has formed on its back surface a graphic property-imparting layer. The layer is composed of (a) an inorganic pigment having a number average particle diameter of from 0.2 to 2.0 microns and an oil absorbing degree of not more than 100 cc/100 g and (b) a resin cured by irradiation with electron beams.
    Type: Grant
    Filed: November 6, 1984
    Date of Patent: September 30, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Takashi Takayanagi
  • Support of photographic paper
    Patent number: 4610924
    Abstract: A support of photographic paper one of whose surfaces is provided with a writing-retainable layer capable of retaining penciled characters, marks, ink, etc. The writing-retainable layer comprises crystalline silica having a number-average particle size of 0.1-3.0 .mu.m and a film-forming organic polymer.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: September 9, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa, Kazuyuki Koike
  • Heat-sensitive recording paper
    Patent number: 4567497
    Abstract: A heat-sensitive recording paper is described, comprising a paper support and a heat-sensitive color-forming layer on the paper support, wherein the paper support contains a cationic softening agent, such as a maleic anhydride copolymer/polyalkylenepolyamine reaction product. This recording paper is excellent both in highspeed recording and curling properties.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: January 28, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Process for the preparation of highly sized paper
    Patent number: 4508751
    Abstract: A process for the preparation of a highly sized paper which comprises subjecting a paper containing a sizing agent to electron radiation. A photographic support showing reduced developing solution permeation is also disclosed.
    Type: Grant
    Filed: March 24, 1983
    Date of Patent: April 2, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa
  • Water-proof photographic support
    Patent number: 4439496
    Abstract: A water-proof photographic support comprising a paper sheet coated with a polyolefin on both surfaces thereof, in which the paper sheet contains an alkylketene dimer, a cationic polyacrylamide and an anionic polyacrylamide.
    Type: Grant
    Filed: April 28, 1982
    Date of Patent: March 27, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa, Minoru Ono
  • Photographic support
    Patent number: 4433030
    Abstract: A water-proof photographic support comprising a paper sheet coated with a polyolefin on both surfaces thereof, in which the paper sheet contains both of an alkylketene dimer and a cationic polyacrylamide.
    Type: Grant
    Filed: April 28, 1982
    Date of Patent: February 21, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigehisa Tamagawa, Tetsuro Fuchizawa