Patents by Inventor William J. B. Heffernan

William J. B. Heffernan 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).

  • Transformers and coupled inductors with optimum interleaving of windings
    Patent number: 5543773
    Abstract: A transformer or coupled inductor with any arbitrary turns ratio (for example, non-integral), and optionally with multiple secondary windings, has primary and secondary windings interleaved on the same winding layer, preferably around a magnetically permeable or an air core. This is capable of giving optimum magnetic coupling, minimum leakage fields and negligible proximity effect losses. The electrical turns ratio is determined by series or parallel, or combination series-parallel, connections of the physical turns of each winding.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: August 6, 1996
    Assignee: Electrotech Instruments Limited
    Inventors: Peter D. Evans, William J. B. Heffernan