Patents by Inventor Yoshiyuki Fujisawa

Yoshiyuki Fujisawa 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).

  • Trip control device for circuit breaker
    Patent number: 5375032
    Abstract: A trip control device for monitoring and tripping a circuit breaker includes a first voltage detector 11 and a second voltage detector 12 for detecting the first and second reference voltages corresponding to the maximum allowable voltage level and the operation resumable voltage level, wherein the second reference voltage is set higher than the first reference voltage. The output of the second voltage detector 12 at logical 1 reduces the output of the first voltage detector 11 to the logical 0 through a transistor 14 and a capacitor 15 with a predetermined delay. The logical sum T of the outputs of the first voltage detector 11and the second voltage detector 12, output from the OR gate 13, turns off the drive circuit 3 when at logical 0, to de-energize the electromagnetic coil 4 and render the associated circuit breaker incapable of being made.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: December 20, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiro Hatakeyama, Yoshiyuki Fujisawa
  • Method of casting molten metal using mold additives
    Patent number: 3949803
    Abstract: A mould flux which comprises at least 30% by weight of a mixture comprising:I. wollastonite;Ii. at least one low melting fluxing agent.
    Type: Grant
    Filed: July 30, 1974
    Date of Patent: April 13, 1976
    Assignee: Foseco International Limited
    Inventors: Makoto Hiroishi, Kazuo Mitsunaga, Yoshiyuki Fujisawa