Patents by Inventor Ning-Sheng Xu

Ning-Sheng Xu 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).

  • Method and apparatus for generating particle beams
    Patent number: 5111042
    Abstract: A source of atomic or molecular particles includes a source of ionized particles (1), an extraction electrode (2) and an einzel lens (3) to focus a beam of particles. A Wien filter (4) selects particles in said beam having a predetermined velocity and a charge exchange cell (7) neutralizes the ionized particles prior to the extraction of non-ionized particles from the beam.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: May 5, 1992
    Assignee: National Research Development Corp.
    Inventors: John L. Sullivan, Ning-Sheng Xu