Patents by Inventor Ronald J. Morrell

Ronald J. Morrell 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).

  • Electret microphone with simplified electrical connections by printed circuit board mounting
    Patent number: 4188513
    Abstract: A telephone transmitter sub-assembly has an electret clamped between a pair of printed circuit boards. The electret conducting surface and printed circuit patterns on the boards have an overlapping arrangement at a planar junction. The arrangement connects a capacitor, of which the electret forms part, into an amplifying circuit.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: February 12, 1980
    Assignee: Northern Telecom Limited
    Inventors: Ronald J. Morrell, Beverley W. Gumb, Algirdas J. Dragunevicius