Patents by Inventor John M. Field

John M. Field 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).

  • Non-invasive testing of video signals with a jack module and amplification circuit
    Patent number: 5594347
    Abstract: A non-invasive testing system for video signals includes a jack having a monitor conductor connected across an amplification circuit to a central conductor. The amplification circuit amplifies the power of a signal drawn off of the central conductor such that the power level at the monitor conductor is substantially equal to the power level on the central conductor. When it is desired to test a power level of a signal being produced by a video source, test equipment is connected to the monitor conductor to permit non-invasive testing of the signal.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: January 14, 1997
    Assignee: ADC Telecommunications, Inc.
    Inventors: Dominic J. Louwagie, Steven L. Carolus, John M. Field, Daniel J. Murphy, Jeffery O. Brown, James D. Dewey
  • Jack module
    Patent number: 5348491
    Abstract: A jack module including a switching jack subassembly and monitor jack assembly includes a printed circuit board between the subassemblies. The subassemblies and circuit board are commonly housed. The printed circuit board contains monitor circuitry.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: September 20, 1994
    Assignee: ADC Telecommunications, Inc.
    Inventors: Dominic J. Louwagie, John M. Field