Patents by Inventor Iwami Nagata

Iwami Nagata 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).

  • Screw for double-shaft extruding device and double-shaft extruding device
    Patent number: 5545024
    Abstract: A screw for a double-shaft extruding device having a shaft and a spiral flight provided at an outer periphery of the shaft. A height of the flight from an axis of the shaft is substantially constant. An angle of torsion of a spiral of the flight becomes smaller toward a shaft distal end. A cross-sectional area of extrusion formed by the shaft and the flight continuously increases from the shaft distal end to a shaft proximal end. Material can be smoothly discharged and completely extruded.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: August 13, 1996
    Assignee: Bridgestone Corporation
    Inventors: Toshiro Iwata, Iwami Nagata, Akira Hatakeyama, Kazuhisa Nishigai
  • Screw for double-shaft extruding device and double-shaft extruding device
    Patent number: 5464282
    Abstract: A screw for a double-shaft extruding device having a shaft and a spiral flight provided at an outer periphery of the shaft. A height of the flight from an axis of the shaft is substantially constant. An angle of torsion of a spiral of the flight becomes smaller toward a shaft distal end. A cross-sectional area of extrusion formed by the shaft and the flight continuously increases from the shaft distal end to a shaft proximal end. Material can be smoothly discharged and completely extruded.
    Type: Grant
    Filed: October 26, 1993
    Date of Patent: November 7, 1995
    Assignee: Bridgestone Corporation
    Inventors: Toshiro Iwata, Iwami Nagata, Akira Hatakeyama, Kazuhisa Nishigai