Patents by Inventor Akira Shigaki

Akira Shigaki 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).

  • Method of controlling power conversion device
    Patent number: 8659918
    Abstract: A correction-term adder 1 compares a maximum value max(V*) with an absolute value of a minimum value min(V*). The correction-term adder 1 selects a signal 1?max(V*) when the maximum value max(V*) is larger than the absolute value of the minimum value min(V*), on the other hand, selects a signal ?1?min(V*) when the absolute value of the minimum value min(V*) is larger than the maximum value max(V*). Thereby, a signal of correction amount ? is calculated. Moreover, the correction-term adder 1 produces a triangular-wave-shaped signal k(max(V*)+min(V*)) by multiplying a gain k by an addition signal max(V*)+min(V*) of the maximum value max(V*) and the minimum value min(V*). This triangular-wave-shaped signal k(max(V*)+min(V*)) is synchronized with the correction amount ?.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: February 25, 2014
    Assignee: Meidensha Corporation
    Inventors: Masakazu Muneshima, Yasuhiro Yamamoto, Yu Sasaki, Takuya Sugai, Akira Shigaki
  • METHOD OF CONTROLLING POWER CONVERSION DEVICE
    Publication number: 20120033470
    Abstract: A correction-term adder 1 compares a maximum value max(V*) with an absolute value of a minimum value min(V*). The correction-term adder 1 selects a signal 1?max(V*) when the maximum value max(V*) is larger than the absolute value of the minimum value min(V*), on the other hand, selects a signal ?1?min(V*) when the absolute value of the minimum value min(V*) is larger than the maximum value max(V*). Thereby, a signal of correction amount ? is calculated. Moreover, the correction-term adder 1 produces a triangular-wave-shaped signal k(max(V*)+min(V*)) by multiplying a gain k by an addition signal max(V*)+min(V*) of the maximum value max(V*) and the minimum value min(V*). This triangular-wave-shaped signal k(max(V*)+min(V*)) is synchronized with the correction amount ?.
    Type: Application
    Filed: April 15, 2010
    Publication date: February 9, 2012
    Inventors: Masakazu Muneshima, Yasuhiro Yamamoto, Yu Sasaki, Takuya Sugai, Akira Shigaki
  • Plastic air cylinder assembly
    Patent number: 4207807
    Abstract: A plastic air cylinder assembled by the specific combination of a plurality of metal tie rods, inside and outside nuts, a resilient and compressible member and supporting plates whereby the plastic cylinder tube is permitted to expand more than the metal tie rods.
    Type: Grant
    Filed: August 31, 1978
    Date of Patent: June 17, 1980
    Assignee: Oiles Industry Co., Ltd.
    Inventors: Yataro Takata, Yukinori Takenoshita, Kiyoshi Sasahara, Akira Shigaki, Kazuo Hirai, Kosei Maeda, Hideo Tadokuro, Hirokazu Maeda