Patents by Inventor André Schwarkopf

André Schwarkopf 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).

  • Printing and photocopying device and method whereby one toner mark is scanned at at least two points of measurement
    Patent number: 6434346
    Abstract: The invention relates to an electrographic printing or photocopying device and method. A toner mark (10) is provided on a photoconductive drum and printed with toner using a developing station. The toner mark (10) is scanned by a sensor at two points of measurement (a1,a2). The amount of toner in a developing mixture consisting of two components depends upon the difference (&Dgr;U) or the quotient of the amount of the signals of the sensor at both points of measurement. A device which is also disclosed enables the exact length of the toner mark (10) to be determined.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: August 13, 2002
    Assignee: Océ Printing Systems GmbH
    Inventors: Joseph Knott, André Schwarkopf, Peter Bremmer