Patents by Inventor Seiichirou Fukai

Seiichirou Fukai 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).

  • Automatic gain control circuit using PIN diode capable of improving noise figure while improving frequency band characteristic and bidirectional CATV receiver including such circuit
    Patent number: 6028647
    Abstract: An input high frequency signal passes through a PIN diode having a variable high frequency resistance and is output from an AGC circuit. The PIN diode is connected so as to be biased forward between an AGC signal level and a fixed voltage level (such as ground potential). A bias resistor and a coil are connected in series between a node on the output side of the PIN diode and a node supplied with the ground potential. More specifically, the resistor and the coil are inserted in parallel between the transmission path for high frequency signals and the ground potential.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: February 22, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiichirou Fukai, Shigeto Masuda
  • Up-down tuner having a grounding plate provided with generally L-shaped soldering portions
    Patent number: 5668701
    Abstract: In an up-down tuner in which a printed wiring board and a metal chassis penetrating a slit formed in the printed wiring board are bonded by solder with each other, a grounding plate provided with soldering portions having an approximately L-shaped profile is incorporated in an engaged state with the metal chassis. The printed wiring board and the metal chassis are soldered to each other via the soldering portions.
    Type: Grant
    Filed: July 27, 1995
    Date of Patent: September 16, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Seiichirou Fukai