Patents by Inventor Wolfgang J. Bauernfeind

Wolfgang J. Bauernfeind 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).

  • Environmental stress screening process
    Patent number: 5187432
    Abstract: A method that stress assembled circuit boards well beyond normal operational limits both with respect to supply voltages and temperature cycling. The circuit boards are transferred between a cold bath of inert liquid and a hot bath of inert liquid while the power voltages are being applied for short periods of time at voltages which exceed the nominal voltages of the devices. The circuit boards are transferred from the hot bath to the cold bath or vice versa in less than 30 seconds, and maximum stresses are achieved without damaging parts or the circuit boards.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: February 16, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Wolfgang J. Bauernfeind, Frank T. Beard, Edwin Z. Brown, Craig E. McMurray, Joseph E. Pigg