Patents by Inventor Koichi Sekiguchi

Koichi Sekiguchi 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: 4175216
    Abstract: An intercom calling apparatus in a key telephone system including a page switch for switching the transmitter from a talking circuit network to an intercom calling path while a contemporaneous call on a central office line is held by the series combination of a resister and a varistor forming a parallel circuit with the transmitter in the talking circuit network.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: November 20, 1979
    Assignee: Iwatsu Electric Co., Ltd.
    Inventors: Gunzo Kita, Koichi Sekiguchi
  • Patent number: 4104981
    Abstract: An indicator comprises first means adapted for emitting a ray of light; and second means having an indicating surface for receiving the ray of light to permit the ray of light to illuminate the indicating surface. The first and second means are movable relative to each other to vary intensity of illumination of the indicating surface.
    Type: Grant
    Filed: August 30, 1976
    Date of Patent: August 8, 1978
    Assignee: Nissan Motor Company, Ltd.
    Inventors: Katsutoshi Ono, Koichi Sekiguchi
  • Patent number: 3973083
    Abstract: A rotary dial device for a telephone set, in which an additional function of preventing a toll dialling is provided. In accordance with this invention, a contact is further attached to an usual dial to classify dial impulses so that when a number "1," one of numbers "2" to "9," and a number "0" are dialled, one, two and three pulses are produced respectively. The dialling function subsequent to the first dialling number "0" and the first and second dialling numbers "10" is effectively stopped by counting the classified pulses.
    Type: Grant
    Filed: January 30, 1974
    Date of Patent: August 3, 1976
    Assignee: Iwasaki Tsushinki Kabushiki Kaisha
    Inventor: Koichi Sekiguchi
  • Patent number: 3971898
    Abstract: A visual indicator control circuit for use in key telephone systems is disclosed. The circuit includes a plurality of light emitting diodes connected in series and operated by a plurality of transistors having collector-emitter paths connected in parallel with the light emitting diodes. Circuits are provided for controlling the respective base electrode voltages of the transistors corresponding to the use status of each line to control the light emitting diodes corresponding to the on or off states of the transistors.
    Type: Grant
    Filed: March 14, 1975
    Date of Patent: July 27, 1976
    Assignee: Iwatsu Electric Co., Ltd.
    Inventors: Tokuhisa Hijikata, Koichi Sekiguchi