Patents by Inventor Toyoziro Naokawa

Toyoziro Naokawa 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).

  • Transistor amplifier circuit
    Patent number: 4219781
    Abstract: A gain control transistor amplifier circuit employing as a double balance type cascade amplifier comprises two differential amplification stages. Current mirror circuits are provided for the respective stages for applying the outputs of these stages to a constant current source circuit. A resistor and a DC stabilization voltage source are connected to the output stage of the latter current mirror circuit, thereby obtaining an output which is stable irrespective of the gain control operation thereof.
    Type: Grant
    Filed: November 14, 1978
    Date of Patent: August 26, 1980
    Assignee: Toko Kabushiki Kaisha
    Inventor: Toyoziro Naokawa
  • FM Receiver muting range setting circuit
    Patent number: 4199725
    Abstract: A muting range setting circuit for an FM receiver uses a pair of differential amplifiers. Each of the differential amplifiers employs the same transistors having like polarity with common input and output terminals. The output of the tuner AFC is compared with an input reference voltage in the differential amplifier circuit and the output representing the frequency deviation of the FM detecting circuit is applied to the gate driving circuit for control of the muting operation.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: April 22, 1980
    Assignee: Toko, Inc.
    Inventor: Toyoziro Naokawa