Patents by Inventor Seiki Shimazu

Seiki Shimazu 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).

  • Apparatus for making a plurality of optical record disc subtrates
    Patent number: 5648105
    Abstract: A method of making a plurality of optical record disc substrates includes the steps of injecting a resin material into a plurality of disc-shaped cavities which are formed by closing a fixed mold half and a movable mold half; and cooling the injected resin material in the cavities. The cavities are grouped into a plurality of groups so that each group includes not less than one cavity, and each group is provided with a common actuation device so that each actuation device is independently operated.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: July 15, 1997
    Assignee: TDK Corporation
    Inventors: Seiki Shimazu, Kenji Yamaga, Yoshimi Sakai, Atsushi Koyama, Yuichi Namikawa
  • Method of making a plurality of optical record disc substrates
    Patent number: 5458821
    Abstract: A method of making a plurality of optical record disc substrates includes the steps of injecting a resin material into a plurality of disc-shaped cavities which are formed by closing a fixed mold half and a movable mold half; and cooling the injected resin material in the cavities. The cavities are grouped into a plurality of groups so that each group includes not less than one cavity, and each group is provided with a common actuation device so that each actuation device is independently operated.
    Type: Grant
    Filed: November 3, 1993
    Date of Patent: October 17, 1995
    Assignee: TDK Corporation
    Inventors: Seiki Shimazu, Kenji Yamaga, Yoshimi Sakai, Atsushi Koyama, Yuichi Namikawa
  • Tape cover of magnetic tape cassette and process for preparing tape cover
    Patent number: 4382522
    Abstract: A tape cover made of resin comprises a single-piece L-shaped body of an upper plate and a front plate and an erroneous insertion detecting notch formed in the joint of the plates, wherein a gate is formed in the notch and the thickness of the wall of a portion adjacent the notch in the upper plate is smaller than the distance from the edge of the upper plate to the most remote part of the diameter of the gate.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: May 10, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Seiki Shimazu, Masaoki Sekine
  • Tape cover of magnetic tape cassette and process for preparing tape cover
    Patent number: 4382523
    Abstract: A tape cover formed by molding an L-shaped body of an upper plate and a front plate in one piece in which an erroneous insertion detecting notch is formed in the joint portion of both the plates comprises an injecting port as a gate positioned on a side surface of said upper plate in said notch, and the thickness of the wall of said upper plate just below said injecting port is larger than that of the other part of the wall of said upper plate near said injecting port wall.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: May 10, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Masaoki Sekine, Seiki Shimazu