Patents by Inventor Donald W. Karal

Donald W. Karal 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).

  • Cleaning brush for electrostatic copiers, printers and the like
    Patent number: 4361922
    Abstract: A cleaning brush for dry electrostatic copiers and printers is provided with two or more types of bristles, one of which is made from a conductive material, the other types to be made from non-conductive materials; the conductive bristles are all of equal or shorter length in relationship to the non-conductive bristles.
    Type: Grant
    Filed: January 6, 1981
    Date of Patent: December 7, 1982
    Assignee: Schlegel Corporation
    Inventor: Donald W. Karal