Patents by Inventor Karl Hirschauer

Karl Hirschauer 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).

  • Contrast enhancement device for led arrays
    Patent number: 6392614
    Abstract: A contrast enhancement device for an LED display is achieved by providing rectangular wire screen of substantially the dimensions of the LED-bearing face of a module block LED array. The edges of the rectangular wire screen are ultrasonically welded to the edges of the LED-bearing face of the module block LED array.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: May 21, 2002
    Assignee: Trans-Lux Corporation
    Inventors: Karl Hirschauer, Fred Duray, Joseph M. Doering