Patents by Inventor Edward W. Nelson

Edward W. Nelson 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).

  • Test head including displaceable switch element
    Patent number: 6794887
    Abstract: A pin card for mounting in a test head of a semiconducter integrated circuit tester to implement test channels of the tester includes contact pins connected to terminals of respective test channels. Each contact pin has a free end for engaging a load board. A conductive switch element is displaceable between a first position, in which the switch element is electrically isolated from one or more of the contact pins, and a second position, in which the switch element is in electrically conductive contact with one or more of the contact pins.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: September 21, 2004
    Assignee: Credence Systems Corporation
    Inventors: Edward W. Nelson, Travis S. Ellis, Paul D. Wohlfarth