Patents by Inventor Hiroshi Kawarai

Hiroshi Kawarai 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).

  • Wire saw control method and wire saw
    Patent number: 6178961
    Abstract: A sensor measures a displacement of a sensor, and a control part of a wire saw calculates a sliding load in accordance with the measured displacement and an initial tension of the wire. Then, the control part compares the calculated cutting load with a preset reference value, and controls an ingot feed speed for a drive unit of a workpiece feed table in accordance with the results of the comparison.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: January 30, 2001
    Assignees: Tokyo Seimitsu Co., Ltd., Super Silicon Crystal Research Institute Corp.
    Inventors: Shinji Nagatsuka, Shigeru Okubo, Hiroshi Kawarai, Hiroshi Oishi, Keiichiro Asakawa, Junichi Matsuzaki