Patents by Inventor Rolf Stahelin

Rolf Stahelin 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).

  • 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