Patents by Inventor Wolfgang Feist

Wolfgang Feist 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).

  • Patent number: 6160567
    Abstract: An electrostatic write head for writing pixels on a print cylinder is disclosed in which a continuous wave radio-frequency source is applied to a radio-frequency electrode disposed on a first side of a dielectric body. A control electrode is disposed on the second side of the dielectric body. When the voltage at the radio-frequency electrode is sufficiently high, a plasma containing electrons, negatively charged ions and positively charged ions ignites near the second side of the dielectric body. While these conditions are maintained, a varying control signal is applied to the control electrode. When a print cylinder having a conducting reference electrode is brought near the plasma, the plasma contacts the surface of the print cylinder and causes it to become charged to a voltage which directly relates to the control signal, thus writing a charged pixel on the surface of the print cylinder.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: December 12, 2000
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Wolfgang Feist