Patents by Inventor Akio Jitsumori

Akio Jitsumori 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).

  • Receiving apparatus
    Patent number: 5189415
    Abstract: A receiving apparatus for receiving information transmitted from a bottomhole to a surface by means of electromagnetic waves. The receiving apparatus includes a receiving antenna for receiving a transmitted signal from the bottomhole, a noise detector for detecting noise current received by the receiving antenna, and a noise canceller for removing noise components received by the receiving antenna by comparing an output signal from the receiving antenna and an output signal of the noise detector. The noise canceller is a noise canceller using parallel adaptive filters, and includes a plurality of adaptive filters arranged in parallel fashion, an adder for summing output signals of the plurality of adaptive filters, and a subtracter for subtracting an output signal of the adder from a main input signal.
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: February 23, 1993
    Assignee: Japan National Oil Corporation
    Inventors: Takashi Shimada, Satoru Inoue, Takaaki Maekawa, Akio Jitsumori