Patents by Inventor Chitoshi Yamada

Chitoshi Yamada 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: 5099442
    Abstract: A temperature control apparatus of a learning type for a furnace which runs repetitively with a certain operating pattern of temperature change with time. The apparatus has a dual system model with respect to an enlarged system consisting of the furnace and its controller. For each cycle of the repetition of the certain operating pattern, adjustment input (r) is calculated by using the dual system model and the error between the preset temperature values (r) for the pattern and the actual inside temperatures (y) of the furnace, which adjustment input (r) is applied to the enlarged system to cause the inside temperatures (y) to track the preset temperature values (r). After each cycle of operation, the adjustment input (r) is renewed using the latest value of the above error.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: March 24, 1992
    Assignees: Ohkura Electric Co., Ltd., Katsuhisa Furuta
    Inventors: Katsuhisa Furuta, Iwao Ashahi, Akinori Ito, Nobuhisa Akaba, Chitoshi Yamada
  • Patent number: 5081413
    Abstract: A method and apparatus for measuring AC power, in which a measured digital value of an AC voltage is decomposed into two components with a phase difference of 90.degree. therebetween, while a measured digital value of an AC current is decomposed into two components with a phase difference of 90.degree. therebetween, and a scalar product of a first vector consisting of the two components of the AC voltage and a second vector consisting of the two components of the AC current is calculated. The scalar product thus calculated represents active power carried by the AC current at the AC voltage. Separately, absolute value of vector product of the first vector and the second vector may be calculated, which absolute value of the vector product represents reactive power carried by the AC current at the AC voltage.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: January 14, 1992
    Assignee: Ohkura Electric Co., Ltd.
    Inventors: Chitoshi Yamada, Jin-ichi Kikuchi