Patents by Inventor Koichi Kurasawa

Koichi Kurasawa 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).

  • Surge absorber
    Patent number: 5587867
    Abstract: A surge absorber composed of a surge absorbing element comprising a silicon two-terminal thyristor element having a PNPNP or NPNPN junction structure and a bulk resistance element 12 comprising a material having a resistivity within a range of from 10.sup.-4 .OMEGA..multidot.cm to 10.sup.3 .OMEGA..multidot.cm and having a resistance value within a range of from 5.OMEGA. to 50.OMEGA., these elements being connected in series to form an integral body is disclosed. The inventive surge absorber requires reduced manhours for its production and is of a small size, but yet provides a large surge capacity.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: December 24, 1996
    Assignee: Mitsubishi Materials Corporation
    Inventors: Koichi Kurasawa, Mikio Harada, Takaaki Ito
  • Surge counter
    Patent number: 5572116
    Abstract: A surge detecting element which is connected to surge invading lines and is composed of a gap type discharge tube and a nonlinear resistor both connected in series with each other and one or more of surge absorbing elements each having an impulse discharge starting voltage higher than an impulse discharge starting voltage of the surge detecting element. A light receiving element is provided for the gap type discharge tube in light receiving relationship therewith for detecting a discharge light thereof, a counter circuit for counting a detected signal from the light receiving element is also provided.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: November 5, 1996
    Assignee: Mitsubishi Materials Corporation
    Inventors: Koichi Kurasawa, Yoshiyuki Tanaka, Takaaki Itoh
  • Chip-type surge absorber
    Patent number: 5416662
    Abstract: A single three-terminal chip-type surge absorber combines two or three semiconductor surge-absorbing elements with three electrode plates and resin-molding the combination. When more lines must be connected to an electronic device subject to a voltage surge, instead of mounting a plurality of surge-absorbing elements, which requires a substantial space and many mounting steps, a single surge absorber with a plurality of surge absorbing elements absorbs the voltage surge.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: May 16, 1995
    Inventors: Koichi Kurasawa, Takaaki Ito
  • Junction box with protection function to protect from overvoltage and overcurrent
    Patent number: 5377067
    Abstract: A junction box for the protection of electronic devices and communication lines from lightning surges, overcurrent and overvoltage. The box includes sockets for connection to the devices and liens along with a plurality of combinations of surge absorbing elements and low melting point metal wires for the protection feature.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: December 27, 1994
    Assignee: Mitsubishi Materials Corp.
    Inventors: Yoshiyuki Tanaka, Koichi Kurasawa, Keisuke Kumano