Patents by Inventor Earl W. Springer

Earl W. Springer 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).

  • Tester for aircraft altitude reporting system
    Patent number: 4531127
    Abstract: A ground test system for an aircraft altitude reporting system includes a ramp tester, an antenna coupled to the ramp tester and a switch for interrupting the circuit between the ramp tester and the antenna.
    Type: Grant
    Filed: April 9, 1984
    Date of Patent: July 23, 1985
    Inventor: Earl W. Springer