Patents by Inventor Douglas E. Hof

Douglas E. Hof 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).

  • Closed inductively coupled plasma cell
    Patent number: 4968142
    Abstract: A closed inductively coupled plasma cell generates a relatively high power, low noise plasma for use in spectroscopic studies. A variety of gases can be selected to form the plasma to minimize spectroscopic interference and to provide a electron density and temperature range for the sample to be analyzed. Grounded conductors are placed at the tube ends and axially displaced from the inductive coil, whereby the resulting electromagnetic field acts to elongate the plasma in the tube. Sample materials can be injected in the plasma to be excited for spectroscopy.
    Type: Grant
    Filed: June 2, 1989
    Date of Patent: November 6, 1990
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas J. Manning, Byron A. Palmer, Douglas E. Hof