Patents by Inventor John D. Duncan

John D. Duncan 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).

  • Double balanced mixer using single ferrite core
    Patent number: 4119914
    Abstract: Disclosed is a double balanced mixer using a novel single ferrite core construction. The core includes two apertures and a transformer is wound through each aperture. The two transformers are connected by diodes in the known manner to provide the mixer. The arrangement lends itself to simple construction and provides a mixer which is smaller than heretofore possible and which exhibits exceptional high frequency response and flatness with satisfactory isolation.
    Type: Grant
    Filed: May 18, 1977
    Date of Patent: October 10, 1978
    Assignee: Dana Corporation
    Inventor: John D. Duncan
  • Method of making a transformer assembly
    Patent number: 4052785
    Abstract: Disclosed is a double balanced mixer using a novel single ferrite core construction. The core includes two apertures and a transformer is wound through each aperture. The two transformers are connected by diodes in the known manner to provide the mixer. The arrangement lends itself to simple construction and provides a mixer which is smaller than heretofore possible and which exhibits exceptional high frequency response and flatness with satisfactory isolation.
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: October 11, 1977
    Assignee: Dana Corporation
    Inventor: John D. Duncan