Patents by Inventor Koji Sagawa

Koji Sagawa 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).

  • Patent number: 6329891
    Abstract: A high frequency relay capable of effectively shielding a signal path, yet reducing a number of the parts forming the shield and the associated structure. The relay has a dielectric base mounting three fixed contacts arranged in a line and defined at upper ends of three contact terminals extending through the base. Two movable contact springs are utilized, each bridging the two adjacent fixed contacts for closing and opening a high frequency signal path between the two adjacent fixed contacts. Upstanding from the base is a pair of electromagnetic shield plates which define a shielded space therebetween for accommodating the three fixed contacts and the two movable contact springs. Each of the shield plates is configured to come into electrical contact with corresponding one of the movable contact springs moved in the contact opening position.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: December 11, 2001
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Tokatoshi Hayashi, Atsushi Nakahata, Takuji Yamashita, Hidetoshi Takeyama, Koji Sagawa, Tetsuya Yamada, Tomohiro Taguchi, Hisao Yabu
  • Patent number: 4388757
    Abstract: Method for manufacturing an electric switching block of an electromagnetic relay wherein a rocking armature end or ends of an electromagnetic block drives respective movable contactor spring plates between opposing fixed contact terminals in respective switching sections of the switching block.
    Type: Grant
    Filed: December 24, 1980
    Date of Patent: June 21, 1983
    Assignees: Matsushita Electric Works, Ltd., Hans Sauer
    Inventors: Hidetoshi Takeyama, Siro Sakamoto, Koji Sagawa, Tokio Tanishi, Hiroaki Aihoshi, Takao Morimoto