Patents by Inventor Noriaki Hatanaka

Noriaki Hatanaka 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).

  • Current drive circuit for an induction coil
    Patent number: 4249219
    Abstract: A current drive circuit for an induction coil is provided comprising a clamp circuit connected to the two terminals of the coil. This clamp circuit prevents the voltages of the two terminals from dropping below a reference voltage, thereby preventing decreases of the amplifier constants h.sub.FE of the transistors which are also coupled to the two terminals for a read-out operation.
    Type: Grant
    Filed: May 24, 1979
    Date of Patent: February 3, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Hajime Aoi, Takashi Tamura, Makoto Koizumi, Noboru Kunimi, Minoru Enomoto, Noriaki Hatanaka