Patents by Inventor Roland E. Stalder

Roland E. Stalder 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).

  • Array of micro-machined mass energy micro-filters for charged particles
    Patent number: 5486697
    Abstract: An energy filter for charged particles includes a stack of micro-machined wafers including plural apertures passing through the stack of wafers, focusing electrodes bounding charged particle paths through the apertures, an entrance orifice to each of the plural apertures and an exit orifice from each of the plural apertures and apparatus for biasing the focusing electrodes with an electrostatic potential corresponding to an energy pass band of the filter.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: January 23, 1996
    Assignee: California Institute of Technology
    Inventors: Roland E. Stalder, Thomas R. Van Zandt, Michael H. Hecht, Frank J. Grunthaner