Patents by Inventor Willi Fencl

Willi Fencl 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).

  • Liquid ion chamber electrode apparatus
    Patent number: 5631470
    Abstract: The present invention provides electrode assemblies for LIC imagers that maximize ion collection and the electric field for the minimum bias voltage. To achieve this optimization the ion collection is confined to small regions. Due to this limited ion collection region, high neutralization efficiencies and fast sweep-out times can be obtained. Furthermore, with an electrode separation of approximately 0.1 millimeters, pulse voltages of less than 100 volts can be used. Low voltages result in improved reliability, longer system life, and lower safety risks.
    Type: Grant
    Filed: May 13, 1996
    Date of Patent: May 20, 1997
    Assignee: Varian Associates, Inc.
    Inventors: Derek J. Day, Reza Majidi-Ahy, Willi Fencl, Heinrich Riem, Salvatore Provencale, Rolf Staehelin
  • Three terminal ion chambers
    Patent number: 5594252
    Abstract: A three terminal ionization chamber includes a first electrode coupled to a bias voltage source spaced apart from a second electrode coupled to ground. A third terminal is provided which is positioned between the first and second electrodes. Measurement circuitry may be coupled to the third terminal to measure charge indicative of the amount of radiation incident to the chamber.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: January 14, 1997
    Assignee: Varian Associates, Inc.
    Inventors: Derek J. Day, Rolf Stahelin, Salvatore Provenzale, Heinrich Riem, Willi Fencl