Patents by Inventor Takahiro Katsumi

Takahiro Katsumi 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 protection circuit and overcurrent protection method of the circuit
    Patent number: 5977758
    Abstract: In an overcurrent protection circuit, when a control section turns on a switch in response to a signal from a microcomputer so that power is supplied from a power source to an IC card, a signal controlling section prevents the overcurrent protection circuit from functioning even if a current greater than a predetermined level is detected by a current detecting section, until a voltage of the IC card is stabilized. When the control section turns off the switch in response to a signal from the microcomputer, the power supply from the power source to the IC card is stopped, thereby preventing a malfunction of the overcurrent protection circuit, even if the microcomputer goes out of control or malfunctions.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: November 2, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Minoru Noguchi, Takahiro Katsumi, Toshiyuki Suzuki, Toshiyuki Kawagishi