Patents by Inventor Joseph J. Eash

Joseph J. Eash 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).

  • Broadband electromagnetic absorption via a collisional helium plasma
    Patent number: 5594446
    Abstract: A system (20) for broadband electromagnetic absorption in an anechoic chamber (22) has walls (24) of the chamber (22) forming a sealed space. A plurality of ionization sources (30) are mounted on an inside surface of the walls (24), facing the sealed space (28), with a spacing to give one ionization source/m.sup.2 of chamber (22) surface. An electron beam source (32) is connected to the ionization sources (30). A source (36) of helium gas is connected to supply the helium to the space (28). An electronic unit (42) under test is inside the anechoic chamber, and is connected to a test system (44). The test system (44) is also connected to the electron beam source (32). The ionization sources (30) generate a helium plasma in the space (28) by pulsed operation of the electron beam source (32).
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: January 14, 1997
    Assignee: SRI International
    Inventors: Robert J. Vidmar, Donald J. Eckstrom, Joseph J. Eash, Walter G. Chestnut