Patents by Inventor Katsu Ito

Katsu Ito 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).

  • Television synchronous receiver with phase shifter for reducing interference from a lower adjacent channel
    Patent number: 5122879
    Abstract: A television receiver includes a baseband 90.degree. phase shifter, an adder, and a phase equalizer. The baseband 90.degree. phase shifter obtains in-phase video signals from the video signals of the I and Q signal blocks. The adder voltage-adds the in-phase video signals together. The phase equalizer corrects phase distortion of an output signal from the adder. The 90.degree. phase shifter has an operating frequency band including at least a received channel and a lower adjacent channel. A video signal is extracted from the phase equalizer.
    Type: Grant
    Filed: June 1, 1990
    Date of Patent: June 16, 1992
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Katsu Ito
  • 3-Dimensional integrated circuit for liquid crystal display TV receiver
    Patent number: 4758896
    Abstract: A multi-layer integrated circuit having through-hole inter-layer connections includes an integrally formed liquid crystal display panel, and performs all receiving, amplifying and video display functions of a TV receiver when connected to an antenna. Shield layers are incorporated to prevent transmission of interference from a display drive section of the integrated circuit to the antenna or the input stage of an I.F. amplifier section, and to prevent interference between the local oscillator of a tuner section and the I.F. amplifier.
    Type: Grant
    Filed: December 9, 1986
    Date of Patent: July 19, 1988
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Katsu Ito
  • Television receiver having a liquid crystal display device
    Patent number: 4694347
    Abstract: A television receiver has a receiving circuit for producing audio signals and video signals, a liquid crystal display panel, and a driving circuit responsive to the video signals for driving the liquid crystal display panel. The receiving circuit and driving circuit include elements provided on an SOS substrate.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: September 15, 1987
    Assignee: Citizen Watch Co. Ltd.
    Inventor: Katsu Ito
  • Television receiver having a liquid crystal display device
    Patent number: 4663670
    Abstract: A television receiver having a liquid crystal display device includes a receiver having a electromagnetically shielded case and a receiving circuit provided in the shielded case and electrically connected to an antenna for producing audio signals and video signals. A liquid crystal display panel of the liquid crystal display device is electromagnetically shielded by a transparent and conductive shielding film for shielding the liquid crystal display panel.
    Type: Grant
    Filed: December 11, 1984
    Date of Patent: May 5, 1987
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Katsu Ito, Munehiro Shinabe, Akira Miyajima, Nobuyuki Hashimoto, Hideshi Ohno, Akira Tsuzuki, Shigeru Morokawa, Minoru Natori