Patents by Inventor Helmut Ollhaeuser

Helmut Ollhaeuser 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 and device for eliminating interference signals in a light barrier
    Patent number: 5789740
    Abstract: A device and a method for eliminating interference signals in a light barrier. The device includes, having a transmitter, a receiver and an evaluation unit that is connected to the receiver. The transmitter periodically emits light pulse trains with a defined pulse length T.sub.P and a defined period length T.sub.s. In the evaluation unit, the received signals present at the receiver are evaluated only during activation intervals that are limited in time. The length of the activation intervals depends on whether light pulses are recorded during these activation intervals.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: August 4, 1998
    Assignee: Leuze Electronic GmbH + Co.
    Inventor: Helmut Ollhaeuser