Patents by Inventor Jan E. Van Beek

Jan E. Van Beek 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).

  • Segmented-core inductance in stylus for EM-graphical tablet
    Patent number: 5461204
    Abstract: A graphical tablet and a stylus interact electromagnetically with one another. The stylus includes a coil and a transducer to affect an inductance of the coil in response to a force exerted on a tip of the stylus. The transducer comprises first and second ferrite cores. The cores are mounted to move with respect to one another in response to the force. The cores are substantially in contact with one another in the absence of the force. Disengaging causes a well detectable jump in the inductance.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: October 24, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Kofi A. A. Makinwa, Jan E. Van Beek, Marcellinus A. M. Grooten