Patents by Inventor Norio Muguruma

Norio Muguruma 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 protection system
    Patent number: 4399524
    Abstract: A memory protection system includes an auxiliary power supply source for maintaining information stored in a random access memory when the main power supply is terminated. When the main power supply voltage level becomes lower than a preselected level, a detection unit develops a control signal for applying a disabling signal to a chip selection terminal included in the random access memory, whereby a load such as a central processor unit connected to the random access memory is electrically disconnected from the random access memory to minimize the power dissipation.
    Type: Grant
    Filed: February 18, 1981
    Date of Patent: August 16, 1983
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Norio Muguruma, Mitsuo Morihisa, Hideyuki Akao