Patents by Inventor Yukichi Ikuta

Yukichi Ikuta 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).

  • Virtual machine system
    Patent number: 4400769
    Abstract: A virtual machine system is provided with a control program for concurrently operating a plurality of OSs (Operating Systems). The object is to suppress the overhead produced when simulating privileged instructions for controlling program status words (PSWs). For this purpose, there is provided simple hardware, in place of the software control conventionally used, including a modification register for storing information required to modify the current PSW information and a pending register for storing pending interrupt information for communication to the corresponding OS.
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: August 23, 1983
    Assignee: Fujitsu Limited
    Inventors: Saburo Kaneda, Naomi Matsumura, Fujio Ikegami, Kazuyuki Shimizu, Yukichi Ikuta