Patents by Inventor Waho Takao

Waho Takao 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).

  • Multiple-valued logic circuit
    Patent number: 5773996
    Abstract: A multiple-valued logic circuit includes a first device, a second device, a signal source, and a signal output terminal. The second device is connected in series with the first device. The signal source supplies an oscillating voltage across a series circuit consisting of the first device and the second device. The first device is constituted by at least one unit device having first and second main terminals and exhibiting voltage-current characteristics including negative differential resistance characteristics for obtaining a peak current between the first and second main terminals. The second device is constituted by at least two series-connected unit devices each having first and second main terminals and exhibiting voltage-current characteristics including variable negative differential resistance characteristics for obtaining a peak current changing between the first and second main terminals.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: June 30, 1998
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventor: Waho Takao