Patents by Inventor John W. Weigl, deceased

John W. Weigl, deceased 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).

  • Two-color electrophotographic printing machine
    Patent number: 4509850
    Abstract: An electrophotographic printing machine in which a latent image is recorded on a photoconductive surface with modulated and continuously charged regions. The modulated regions are developed with polar or polarizable marking particles with the continuously charged regions being developed with charged marking particles. The charged marking particles and polar or polarizable marking particles are different colors. Both types of marking particles are transferred simultaneously to a copy sheet and subsequently permanently affixed thereto forming a two-color copy.
    Type: Grant
    Filed: August 8, 1983
    Date of Patent: April 9, 1985
    Assignee: Xerox Corporation
    Inventor: John W. Weigl, deceased