Patents by Inventor Meindert Norg

Meindert Norg 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).

  • System for adapting the resonant operation of a personal care appliance during the lifetime thereof
    Patent number: 8314586
    Abstract: The adapting system for a resonant drive appliance includes a circuit for measuring the back EMF induced in the stator coil of the motor following turn-off of the appliance. The frequency of the back EMF signal is determined from the zero crossings of the EMF signal. The determined frequency is then compared with a running average of previous frequency determinations, and the drive frequency of the appliance is adjusted if the difference between the compared frequencies is greater than a threshold value, e.g. 1 Hz.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: November 20, 2012
    Assignee: Koninklijke Philipes Electronics N.V.
    Inventors: Ari Lumbantobing, Kevin Miller, Meindert Norg, Pieter Johannes Bax