Patents by Inventor Takafumi Kuroda

Takafumi Kuroda 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).

  • Overcurrent tripping unit for a circuit breaker
    Patent number: 4853819
    Abstract: In the overcurrent tripping unit for a circuit breaker, current transformers are provided for detecting currents flowing through respective phases of a main circuit, the secondary outputs of the current transformers are star connected, the primary outputs are polyphase full-wave rectified, the voltage drop based on the rectified positive/negative direct output of each phase is directed by first and second resistances to be applied to the control means, and a ground fault current is detected based on the secondary outputs of the current transformers to be applied to the control means.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: August 1, 1989
    Assignee: Terasaki Denki Sangyo Kabushiki Kaisha
    Inventors: Takeshi Suwa, Takafumi Kuroda