Patents by Inventor Tadashi Kawabara

Tadashi Kawabara 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).

  • Memory circuit for graphic images
    Patent number: 4868781
    Abstract: A memory circuit including memory elements on which data read, write and store operations can be arbitrarily performed, the memory elements having a dyadic/arithmetic operation function. In a read/modify/write mode to be executed during a memory cycle and in an interval in which data from the memory elements and data from external devices exist, an operation is executed between external data and the data in the memory elements and the result of such operation is stored during a write cycle, thereby achieving a higher-speed operation.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: September 19, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Koichi Kimura, Toshihiko Ogura, Hiroaki Aotsu, Mitsuru Ikegami, Tadashi Kawabara