Patents by Inventor Sumio Shimada

Sumio Shimada 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).

  • Process for producing pre-foamed particles of polyolefin resin
    Patent number: 4436840
    Abstract: In a process for producing pre-foamed particles of a polyolefin resin which comprises impregnating a volatile blowing agent into particles of a polyolefin resin while dispersing the resin particles and the blowing agent in a dispersing medium under heat in a closed vessel, opening one end of the vessel and releasing the resin particles and the dispersing medium simultaneously into an atmosphere kept at a lower pressure than the inside pressure of the vessel; the improvement wherein the pressure of the inside of the vessel after opening its one end is maintained at a substantially constant pressure which is at least 0.7 times the vapor pressure of the blowing agent before opening the end of the vessel.
    Type: Grant
    Filed: September 21, 1982
    Date of Patent: March 13, 1984
    Assignee: Japan Styrene Paper Corporation
    Inventors: Hiroyuki Akiyama, Sumio Shimada, Kuninori Hirosawa, Hideki Kuwabara
  • Pre-foamed particles of polypropylene resin and process for production thereof
    Patent number: 4379859
    Abstract: Substantially non-crosslinked pre-foamed particles of a polypropylene resin, characterized by the fact that they are composed of an ethylene/propylene random copolymer or a mixture of an ethylene/propylene random copolymer with low density polyethylene and/or an ethylene/vinyl acetate copolymer as a base resin; and a process for producing pre-foamed particles of a polypropylene resin, which comprises dispersing substantially non-crosslinked particles of the polypropylene resin composed of an ethylene/propylene random copolymer or a mixture of an ethylene/propylene random copolymer with low-density polyethylene and/or an ethylene/vinyl acetate copolymer and a volatile blowing agent in water in the presence of a dispersing agent within a closed vessel; heating the dispersion to a temperature above a temperature at which the resin particles soften, thereby to impregnated the blowing agent in the resin particles; and while maintaining the pressure of the inside of the vessel higher than the vapor pressure of the
    Type: Grant
    Filed: November 19, 1981
    Date of Patent: April 12, 1983
    Assignee: Japan Styrene Paper Corporation
    Inventors: Kuninori Hirosawa, Sumio Shimada
  • Method for preparing a polyurethane foam comprising quaternary ammonium salt as antistatic agent
    Patent number: 3933697
    Abstract: An antistatic polyurethane foam contains quaternary ammonium salt as an antistatic agent. The quaternary ammonium salt is added either to a raw material for polyurethane foam or to a prepared polyurethane foam by causing the foam to be impregnated with a solution containing the quaternary ammonium salt and drying it.
    Type: Grant
    Filed: July 30, 1974
    Date of Patent: January 20, 1976
    Assignee: Toyo Rubber Chemical Industrial Corporation
    Inventors: Osamu Fujii, Toshio Kishimoto, Hisao Kosuge, Ryoji Nagamine, Sumio Shimada