Patents by Inventor Shozo Hieda

Shozo Hieda 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).

  • Underdrainage pipe
    Patent number: 4182580
    Abstract: An underdrainage pipe comprises a liquid-collecting pipe, protrusions on the liquid-collecting pipe, a filter layer around the liquid-collecting pipe and a liquid-conducting way, and the protrusions having at least one recess for each and the bottom portion of the recess not reaching the surface of the liquid-collecting pipe.
    Type: Grant
    Filed: March 17, 1978
    Date of Patent: January 8, 1980
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Shozo Hieda, Yoshio Uehara, Minoru Inaba
  • Injection molding of ultra high molecular weight polyethylene
    Patent number: 4164531
    Abstract: Process for injection molding ultra high molecular weight polyethylene by injecting the ultra high molecular weight polyethylene into a cavity having a volume 1.5-3.0 times that of the injected polyethylene at a shear rate of at least 50,000 sec..sup.-1 measured at the gate of the injection nozzle and then compressing the cavity to a volume less than 1.5 times that of the injected polyethylene.
    Type: Grant
    Filed: December 8, 1977
    Date of Patent: August 14, 1979
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Takeshi Shiraki, Shozo Hieda, Tomokazu Ninomiya
  • Process for producing synthetic resin laminates
    Patent number: 4102720
    Abstract: A synthetic resin laminate composed of a supporting plate having protrusions and a foamed sheet having fine through-holes and fixed to the protrusions is produced by placing a foamed sheet extruded on the protrusions of a supporting plate heated to a temperature suitable for fusion-fixing and applying a draft to the supporting plate at a speed more than, but not exceeding 5 times the speed of the foamed sheet.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: July 25, 1978
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Takafumi Kaneko, Shuzo Sasagawa, Noriyuki Ishii, Takashi Hiraoka, Shozo Hieda