Patents by Inventor Masuo Osuga

Masuo Osuga 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).

  • Speed control system for DC motor
    Patent number: 4788478
    Abstract: A speed control system for a DC motor is disclosed. This system includes a first transistor connected between a first terminal and a reference terminal, a second transistor connected between a second terminal and the reference terminal, an error amplifier having first input terminal connected via a reference voltage circuit to the first terminal, a second input terminal connected to a third terminal and an output terminal connected to the bases of the first and second transistors, a first resistor connected between a power terminal and the second terminal, a second resistor connected between the first and third terminals, and a third resistor connected between the second and third terminals, and the motor is connected between the first terminal and the power terminal.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: November 29, 1988
    Assignee: NEC Corporation
    Inventors: Eiichi Ishii, Masuo Osuga