Patents by Inventor Shigeo Nishikawa

Shigeo Nishikawa 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: 5830393
    Abstract: A process for preparing an expanded product of a thermoplastic resin which includes a gas dissolving step of adding supercritical carbon dioxide and/or nitrogen as an blowing agent to a thermoplastic resin, and melting it in the thermoplastic resin, a cooling step of cooling the resulting molten resin composition under a pressure not less than a critical pressure of the blowing agent, a nuclei forming step of discharging the molten resin composition from a die to lower the pressure to a level not more than the critical pressure, and an expansion controlling step of cooling an expanded product of the thermoplastic resin to a level not more than a glass transition temperature or a crystallization temperature of the resin to control a cell diameter of the expanded product.
    Type: Grant
    Filed: July 2, 1997
    Date of Patent: November 3, 1998
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Shigeo Nishikawa, Kaoru Yorita, Kouzo Ichikawa, Haruo Inoue, Michio Eriguchi, Takanori Sueda, Hideo Amemiya
  • Patent number: 4975475
    Abstract: An electrodeposition coating composition containing polymer microparticles of 0.01 to 20 microns size is disclosed. The polymer microparticles have a predetermined range of softening point, solubility parameter, refractive index or crosslinking density.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: December 4, 1990
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Yasuyuki Tsuchiya, Shigeo Nishikawa, Kenshiro Tobinaga, Keizou Ishii, Koichi Saito
  • Patent number: 4698191
    Abstract: A method of producing a polypropylene resin molded product from foamed polypropylene particles is disclosed, which comprises introducing a pressurizing gas into foamed polypropylene particles having closed cells so that the particles have an internal gas pressure of from 0.3 to 2.5 Kg/cm.sup.2 G, charging the particles in a mold cavity while compressing the particles with a pressurizing inorganic gas until the initial apparent volume of the particles is reduced to 50 to 99%, removing the gas from the mold cavity while keeping the foamed particles in a compressed state, and introducing steam in the cavity to cause adhesion of the compressed foamed particles. The method produces a molded product having satisfactory appearance and excellent adhesion among particles in a shortened molding cycle.
    Type: Grant
    Filed: January 29, 1986
    Date of Patent: October 6, 1987
    Assignee: Mitsubishi Yuka Badische Co., Ltd.
    Inventors: Hiroshi Endo, Masakazu Arai, Shigeo Nishikawa, Masanori Saito, Masahiro Tanaka, Kunikazu Nagasaki, Shigeki Mathuno
  • Patent number: 4327045
    Abstract: This invention relates to a cooling process suitable for foam molding of a synthetic resin and its cooling apparatus. Cooling water which is supplied into a flowing pressurized gas is turbulently jetted in the form of a mist into the overall area of respective chambers in a pair of molds. The mist, adhering uniformly to the overall walls of the molds remove latent heat from the mold surface, and consequently uniformly cool the entire mold. Further, a large quantity of steam generated from the mist as well as excess mist are forcibly discharged outside the chambers by a preferred suction means including a blower, etc., whereby the cooling effect on the walls of the molds is further enhanced.
    Type: Grant
    Filed: March 25, 1980
    Date of Patent: April 27, 1982
    Assignee: Yuka Badische Company Limited
    Inventors: Shigeo Nishikawa, Masaaki Yokoyama
  • Patent number: 4251226
    Abstract: A device for preventing backfire of inflammable gases comprising a cylinder, a balance spring, and a repelling magnet case. The cylinder holds both a valve casing whose rear edge shuts a gas induction passage when the casing is pushed backward by high pressure, and a check valve which contains a repelling magnet and which shuts and opens a gas supplying passage and a flow-way formed in the valve casing. The repelling magnet case, which is pushed backward by the balance spring, contains a repelling magnet aligned face-to-face with a magnet that is contained in the check valve.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: February 17, 1981
    Assignee: Yamato Sangyo Inc.
    Inventor: Shigeo Nishikawa