Patents by Inventor Seizo Aoki

Seizo Aoki 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: 6054224
    Abstract: An electrical insulating polyester film has an apparent density of 1.37 to 0.85 g/cm.sup.3 and a tensile modulus of 2.0 to 4.5 GPa.A film having low oligomer content, low cost, high heat resistance, high impact resistance, superior machinability and processability, assembling stability, and superior visibility is obtained. Furthermore, leakage of current is reduced when it is used for motor insulation.
    Type: Grant
    Filed: May 6, 1999
    Date of Patent: April 25, 2000
    Assignee: Toray Industries, Inc.
    Inventors: Itsuo Nagai, Seizo Aoki, Yukichi Deguchi
  • Patent number: 5672409
    Abstract: A reflector used in a surface light source comprising a white polyester film in which fine voids are formed and whose apparent specific gravity is in the range of 0.5 to 1.2. The reflectance of the polyester film can be increased by the fine voids. When the reflector having a high reflectance is used in a surface light source having a side light system, a bright scope of, for example, a liquid crystal display easy to see can be obtained.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: September 30, 1997
    Assignee: Toray Industries, Inc.
    Inventors: Katsutoshi Miyakawa, Kenji Tsunashima, Seizo Aoki
  • Patent number: 5407724
    Abstract: A film suitable as a base of image transfer material for thermal recording or a heat-sensitive mimeograph stencil is disclosed. The laminated film of the present invention comprises a coating layer on at least one surface of a polyester film, which coating layer contains as a major component a wax-based composition and has protrusions with length/width ratios of not less than 3 at a density of not less than 20 protrusions/100 .mu.m.sup.2. The film of the present invention, when used as a base of an image transfer material for thermal recording or as a film for heat-sensitive mimeograph stencil, the running property is good, abrasion and staining of the head are very small, shedding of ink when the ink is applied does not occur, and the adhesion of the ink, clearness of printed characters, anti-sticking property, holing property and clearness of printing are excellent.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: April 18, 1995
    Assignee: Toray Industries, Inc.
    Inventors: Takashi Mimura, Seizo Aoki, Kazuo Matsuura, Kenji Tsunashima
  • Patent number: 5292471
    Abstract: A polyester film, which is substantially non-oriented and whose main component is polyethylene terephthalate, is formed into a shape for example, a package, at a condition causing no yield point. The formation ability of the polyester film for forming is improved, and a formed body having a good uniformity in thickness can be obtained. Further, the range of the temperature condition causing no yield point can be enlarged by laminating a PET-system polyester, which originally tends to cause a yield point by itself, onto a polyester having no yield point. In such a laminated polyester film, the slipping property and releasing property from a mold of the film can be improved by specifying the ranges of the degree of crystallinity of each layer, the adhesive force at a high temperature of the film and the surface roughness of the film, and the shape of a formed body can be improved.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: March 8, 1994
    Assignee: Toray Industries, Inc.
    Inventors: Tatsuya Ito, Kenji Tsunashima, Hideyuki Yamauchi, Seizo Aoki, Hirokazu Kurome
  • Patent number: 5271985
    Abstract: This invention relates to a polyester film suited for use in optical recording medium. The polyester film of the present invention has a modulus of photoelasticity of not more than 0.9.times.10.sup.-3 mm.sup.2 /kgf, a maximum surface roughness Rt of not more than 100 nm and a mean interval Sm between adjacent surface projections of not less than 20 .mu.m, so that light scattering and interference are not caused, and optical strain is not generated even when a thermal stress or external force is exerted to the film. Thus, the polyester film of the present invention can be used as the supporting layer or cover layer of optical recording media such as optical cards, optical disks and optical recording tapes.
    Type: Grant
    Filed: July 30, 1991
    Date of Patent: December 21, 1993
    Assignee: Toray Industries, Inc.
    Inventors: Kenji Tsunashima, Seizo Aoki, Masaru Suzuki, Toshihiko Hiraoka
  • Patent number: 5076976
    Abstract: A molten polyester sheet is solidified by cooling it on the surface of a mobile cooling medium on which a water film has been formed. The sheet is stretched at least 4.5-fold in overall stretching ratio in a longitudinal direction through a plurality of stretching steps. Since casting is conducted via the water film, water is absorbed in the surface layer and the interior of the cast sheet, thus facilitating orientation by stretching in the longitudinal direction and lowering the stretching temperature. As a result, stretching with a high stretching ratio can be attained by multi-stage stretching without conducting high-temperature stretching. Thus, this process can accelerate film formation, improve productivity, and provide a film having reduced unevenness in thickness, less surface roughness and excellent abrasion resistance.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: December 31, 1991
    Assignee: Toray Industries, Inc.
    Inventors: Seizo Aoki, Kenji Tsunashima, Tetsuo Ikegami, Seiya Sugiura, Morishige Sonoda, Yukio Ota
  • Patent number: 5061565
    Abstract: A film for heat-sensitive mimeograph stencil and a heat-sensitive mimeograph stencil comprising a porous support and the film laminated thereon are disclosed. Since the film of the present invention has an energy of crystal fusion .DELTA.Hu of 3-11 cal/g and has a difference Tm in temperature of the crystal fusion-starting point and the crystal fusion-terminating point of 50.degree. C. to 100.degree. C., the heat sensitivity is high, so that the characters and symbols or figures can be printed clearly, and the unevenness in the thickness and the light and shade of the printed characters may substantially be eliminated. Further, since it is not necessary to make the film thin, productivity and ease of handling may be promoted.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: October 29, 1991
    Assignee: Toray Industries, Inc.
    Inventors: Seizo Aoki, Kenji Tsunashima, Toshiya Yoshii, Yasuji Nakahara, Takashi Sumiya, Takashi Mimura