Patents by Inventor Atsushi Wakusawa

Atsushi Wakusawa 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).

  • Active shielding device based on SQUID and feedback therefrom for the reduction of environmental magnetic noise
    Patent number: 5367259
    Abstract: A magnetic noise reducing device can effectively produce a practically noiseless space that can reduce environmental magnetic noise harmful for measuring biomagnetism with a high magnetism damping factor in low frequency range. The magnetic noise reducing device comprises a SQUID flux meter 1 and a pair of noise canceling coils 2 as minimum components, the feedback current I produced by the SQUID flux meter 1 being supplied to the noise canceling coils 2, the magnetic flux detecting coil of the SQUID flux meter being arranged within a specific central space 4 defined by the noise canceling coils 2 for effective reduction of magnetic noise within that space.
    Type: Grant
    Filed: May 12, 1992
    Date of Patent: November 22, 1994
    Assignee: Hoxan Corporation
    Inventors: Kazutake Matsumoto, Atsushi Wakusawa, Koji Fujioka