Patents by Inventor Kazumi Kuwabara

Kazumi Kuwabara 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).

  • Amplifier equipped with circuit for preventing electrostatic breakdown
    Patent number: 4347482
    Abstract: A circuit for preventing electrostatic breakdown consists of a resistor which is connected between ground and an input terminal of an amplifier including a transistor. A d-c voltage source applies a constant voltage to the resistor at all times, and a series circuit consisting of a diode and a Zener diode connected cathode to cathode. The anode of the Zener diode is grounded in parallel with the above-mentioned resistor, and the Zener voltage of the Zener diode is set so as to be greater than the voltage across the resistor.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: August 31, 1982
    Assignee: Alps Electric Co., Ltd.
    Inventors: Shigeo Ohta, Takeo Suzuki, Kazumi Kuwabara
  • Double superheterodyne tuner for receiving television aural signals
    Patent number: 4322856
    Abstract: A double superheterodyne tuner for receiving television aural signals comprises first local oscillators by which an output of a first mixer receiving a VHF signal or a UHF signal is made a frequency between the VHF signal and the UHF signal, and a second local oscillator by which an output of a second mixer receiving a first intermediate frequency signal is made a frequency of 10.7 MHz. Oscillator frequencies are selected to avoid beat frequency interference for harmonics thereof up to and including the fifth order.
    Type: Grant
    Filed: March 13, 1980
    Date of Patent: March 30, 1982
    Assignee: Alps Electric Co., Ltd.
    Inventors: Shigeo Ohta, Takeo Suzuki, Kazumi Kuwabara