Patents by Inventor Dennis W. Sandstrom

Dennis W. Sandstrom 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).

  • Flexible donor belt
    Patent number: 5717986
    Abstract: A development system which includes a flexible donor belt having groups of electrode array near the surface of the belt is disclosed. The Electrode array has group areas in which perform the function of: Loading; Transferring; Developing; Transferring and Unloading. Each electrode array group area is independently addressable and operatively connected to voltage source in order to supply a voltage in the order of .quadrature.0-1000 volts AC or DC to each group area. The electrodes array group area picks up the toner from the magnetic brush. An electrode array group area connected to the voltage source via phase shifting circuitry such that a traveling wave pattern is established.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: February 10, 1998
    Assignee: Xerox Corporation
    Inventors: Tuan Anh Vo, Mohammad M. Mojarradi, Dennis W. Sandstrom
  • Advanced technique for packaging multiple number of electrically stackable high voltage transistors in one package
    Patent number: 5577617
    Abstract: High voltage circuitry often requires assembling an array of high voltage devices that are electrically isolated from one another. A lead frame that fits within conventional plastic packaging has been designed that will allow electrical isolation of the substrates of two or more transistors mounted together in a single package.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: November 26, 1996
    Assignee: Xerox Corporation
    Inventors: Mohammad M. Mojarradi, Dennis W. Sandstrom, Tuan A. Vo, Abdul Elhatem