Patents by Inventor Sadayoshi Sato

Sadayoshi Sato 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).

  • Method and apparatus for differentiating simultaneous and sequential key strokes
    Patent number: 5424730
    Abstract: A method differentiates simultaneous and sequential key strokes by detecting simultaneous key strokes if two keys are pushed within a judging time T.sub.L. The method includes the steps of (a) measuring a first time T.sub.1 from a time when a first key is pushed to a time when a second key is pushed, and a second time T.sub.2 from the time when the second key is pushed to a time when one of the first and second keys is released, (b) comparing the first and second times T.sub.1 and T.sub.2 with an arbitrary threshold function T.sub.C which is set within the judging time T.sub.L, and (c) differentiating whether key strokes of the first and second keys are simultaneous or sequential based on a comparison result of the step (b).
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: June 13, 1995
    Assignees: Fujitsu Limited, Matsushita Electric Industrial Co. Ltd., Ascii Corp., Sanyo Electric Co. Ltd., Sony Corp., PFU Limited
    Inventors: Kazuko Sasaki, Takashi Hazui, Hitoshi Ebihara, Shuichi Sakaguchi, Akira Kamakura, Sadayoshi Sato