Patents by Inventor William P. Robinson

William P. Robinson 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 extracting well-formed, high current ion beams from a plasma source
    Patent number: 3955091
    Abstract: A well-formed ion beam having a high current is extracted from an ion plasma by a low perveance ion extraction system including focus and extraction electrodes, the extraction electrode having an ion exit aperture and being axially spaced from the focus electrode a distance of at least several times the diameter of the ion exit aperture. A voltage differential is applied between the electrodes to define a plasma sheath at the ion source aperture, and the ion beam is extracted from the plasma sheath.
    Type: Grant
    Filed: November 11, 1974
    Date of Patent: May 4, 1976
    Assignee: Accelerators, Inc.
    Inventors: William P. Robinson, Robert L. Seliger