Patents by Inventor Joyji Nagahira

Joyji Nagahira 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).

  • Surface potentiometer
    Patent number: 4470009
    Abstract: A surface potentiometer comprises a measuring electrode, a chopper for intermittently shielding the electric field between the measuring electrode and an object to be measured, a preamplifier circuit for converting an AC signal induced in the measuring electrode into a low impedance signal, and a printed substrate having the wiring pattern of the preamplifier circuit formed on one surface thereof and the electrode pattern of the measuring electrode formed on the other surface thereof.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: September 4, 1984
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiaki Takayanagi, Koji Suzuki, Nao Nagashima, Hiroshi Ogawa, Kouki Kuroda, Joyji Nagahira