Patents by Inventor Hirokazu Sawano

Hirokazu Sawano 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).

  • Patent number: 4316260
    Abstract: A programmable sequence controller is provided with a display signal processor for preparing and correcting a sequence program in combination with a CRT (or cathode ray tube) display device. The signal processor simply effects signal processing of branch points and composition points in case where a so-called "ladder diagram" constituting the sequence diagram with relay symbols is prepared and displayed. Branch information is stored in an FIFO (or first in first out) register. The branch information is sequentially received and stored, and the information thus stored is read out in the order of storage, thus preparing the ladder diagram. There are provided a register for instructing the FI operation and a register for instructing the FO operation. The sequence display controller is applicable to the cases where a new ladder diagram is to be prepared, the diagram once prepared is corrected, and the operation is checked.
    Type: Grant
    Filed: September 13, 1979
    Date of Patent: February 16, 1982
    Assignees: Hitachi, Ltd., Nissan Motor Co., Ltd.
    Inventors: Keiji Hideshima, Haruo Koyanagi, Hiroharu Suda, Hirokazu Sawano, Masaoki Takaki, Kunio Yamanaka, Isao Yasuda, Kazuyoshi Asada
  • Patent number: 4298958
    Abstract: A sequence control system suitable for checking the operation of an information processor includes a process I/O unit for receiving input data from process inputs and providing output data to process outputs; a sequence processing unit for calculating data at the process outputs by performing sequence operations according to the sequence programs stored in a sequence program memory on the basis of the data at the process inputs; a buffer memory provided between the process I/O unit and the sequence processing unit for storing both the process input data from the process I/O unit and the output data from the sequence processing unit; a control arrangement for setting the input data to the buffer memory and for allowing access to a selected sequence program according to manually set input information; a display for displaying the selected sequence program accessed through the control arrangement; and a switch for interrupting the transfer of I/O data between the process I/O unit and the buffer memory.
    Type: Grant
    Filed: September 7, 1979
    Date of Patent: November 3, 1981
    Assignees: Hitachi, Ltd., Nissan Motor Co., Ltd.
    Inventors: Masaoki Takaki, Hirokazu Sawano, Kunio Yamanaka, Kazuyoshi Asada, Keiji Hideshima, Haruo Koyanagi