Patents by Inventor Osamu Touyama

Osamu Touyama 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).

  • Keyboard unit control system using block scanning techniques
    Patent number: 4591833
    Abstract: A keyboard unit control system having a port which includes a block selection register for specifying one of a plurality of blocks of scanning lines and a scanning data selection register for specifying one of the scanning lines of the corresponding block. The scanning data and block data are supplied to a keyboard unit through the scan line selecting logic. When the operator depresses a key on the keyboard unit, the key is detected by an interrupt detector and a detection signal is supplied to a CPU. The CPU first scans the blocks and then scans the scanning lines in the corresponding block.
    Type: Grant
    Filed: August 4, 1982
    Date of Patent: May 27, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Takatoshi Ishii, Osamu Touyama