Patents by Inventor Alfons J. De Wolf

Alfons J. De Wolf 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).

  • Optoelectronic circuit
    Patent number: 4750838
    Abstract: An optoelectric circuit for measuring the different optical densities of an image carrier, a toned test patch in an otherwise untoned imaging area of a photoconductor surface in a xerographic apparatus, wherein a LED (46) irradiates a test area of the surface, a phototransistor (47) receives radiation reflected from the text area, an amplifier (51) amplifies the output signal of the phototransistor, the LED is driven by the amplified output current of the phototransistor, and the current through the LED is used as a measure of the optical density.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: June 14, 1988
    Assignee: Agfa-Gevaert N.V.
    Inventors: Alfons J. De Wolf, Robert F. Janssens