Patents by Inventor Koen A. J. de Graaff

Koen A. J. de Graaff 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).

  • Method of detecting a malfunction during a displacement of an element by means of a drive system, and device suitable for carrying out such a method
    Patent number: 7173390
    Abstract: A method and a device are provided for detecting the occurrence of a malfunction upon movement of an element by a driving system. While the element is being moved, a difference between a predetermined value and an actual value is determined at regular intervals by means of a processor. A derivative of the difference is determined by the processor at regular intervals. The difference and the derivative both fluctuate around an equilibrium value. Subsequently, only the values on one side of the equilibrium value of both the difference and the derivative are sampled. The sampled values are multiplied and the result is compared with a reference value by means of the processor. The occurrence of a malfunction is established if the result of the multiplication is higher than the reference value.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: February 6, 2007
    Assignee: Assembléon N.V.
    Inventor: Koen A. J. de Graaff