Patents by Inventor Toshimichi Nishizawa

Toshimichi Nishizawa 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).

  • Injection molding machine
    Patent number: 7387509
    Abstract: An injection molding machine includes an injection pot with an injection nozzle and a side casting port for feeding a material into the pot. The tip part of a plunger disposed in the pot is formed in such as shape that the tip part of the injection pot can be generally filled with the material after an injection is completed. A fitting part pressingly cuts off the material from the feeder by allowing a boundary part between the plunger body and its tip to be formed at a corresponding part between the injection pot body and its tip part.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: June 17, 2008
    Assignee: Sanjo Seiki Co., Ltd.
    Inventor: Toshimichi Nishizawa
  • Injection molding machine
    Publication number: 20050220930
    Abstract: An injection molding machine includes an injection pot with an injection nozzle and a side casting port for feeding a material into the pot. The tip part of a plunger disposed in the pot is formed in such as shape that the tip part of the injection pot can be generally filled with the material after an injection is completed. A fitting part pressingly cuts off the material from the feeder by allowing a boundary part between the plunger body and its tip to be formed at a corresponding part between the injection pot body and its tip part.
    Type: Application
    Filed: May 25, 2005
    Publication date: October 6, 2005
    Applicant: Sanjo Sieki Co., Ltd.
    Inventor: Toshimichi Nishizawa
  • Apparatus and method for producing a solid magnet roller using a movable mold
    Publication number: 20020024169
    Abstract: An apparatus and a method for manufacturing a magnet roller makes it possible to remarkably reduce defects on the surface or the inside of a magnet roller and also to control “warp” of the magnet roller sufficiently so that it does not adversely affect the functions of the magnet roller. A metal mold for magnetic field injection molding is composed of two fixed mold counterparts and a movable mold counterpart. The movable mold counterpart is moved to increase the volume of the cavity of the metal mold as a resin-bonded magnet material is injected into the mold.
    Type: Application
    Filed: August 27, 2001
    Publication date: February 28, 2002
    Applicant: Bridgestone Corporation
    Inventors: Toshimichi Nishizawa, Takatoshi Nanba, Kazuhiro Nakada
  • Apparatus for producing a solid magnet roller using a movable mold
    Patent number: 6302669
    Abstract: An apparatus for manufacturing a magnet roller makes it possible to remarkably reduce defects on the surface or the inside of a magnet roller and also to control “warp” of the magnet roller sufficiently so that it does not adversely affect the functions of the magnet roller. A metal mold for magnetic field injection molding is composed of two fixed mold counterparts and a movable mold counterpart. The movable mold counterpart is moved to increase the volume of the cavity of the metal mold as a resin-bonded magnet material is injected into the mold.
    Type: Grant
    Filed: October 27, 1998
    Date of Patent: October 16, 2001
    Assignee: Bridgestone Corporation
    Inventors: Toshimichi Nishizawa, Takatoshi Nanba, Kazuhiro Nakada