Patents by Inventor Junichi Nakajo

Junichi Nakajo 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).

  • Recording medium detecting apparatus for distinguishing between a recording medium having a relatively high coercivity or a relatively low coercivity
    Patent number: 6574058
    Abstract: A technique for detecting a magnetic recording medium such as a strip on a magnetic card so as to distinguish between a case where a magnetic strip has high coercivity and one where it has low coercivity. A magnetic head detects the existence and appropriate positioning of a magnetic strip which is then fed to a permeability sensor that provides an output signal that is a function of the permeability magnetic strip. A circuit responsive to the output of the permeability sensor provides an output signal indicating the high coercivity strip when the permeability sensor output is low and indicating a low coercivity strip when the permeability sensor output is high.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: June 3, 2003
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Fusayoshi Aruga, Kenji Hirasawa, Junichi Nakajo, Kazutoshi Ishikawa