Patents by Inventor Tutomu Ojima

Tutomu Ojima 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).

  • Noncontacting IC card supplied with power from an outside source
    Patent number: 4962485
    Abstract: An IC card such as cash card is disclosed. The IC card has a RAM, a control circuit for controlling access to the RAM, and a power supply circuit receiving outside energy and supplying power to the RAM and the control circuit. A first voltage detector produces a starting output when supply voltage of the power exceeds a predetermined first reference voltage. A second voltage detector produces a control signal when the supply voltage exceeds a predetermined second reference voltage, which is higher than the first reference voltage. An AND gate is provided to produce a RAM control signal for operating the RAM when the starting signal and the control signal are applied thereto.
    Type: Grant
    Filed: February 14, 1989
    Date of Patent: October 9, 1990
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Yoshiaki Kato, Harumi Yuyama, Tutomu Ojima, Hiromi Ishikawa