Patents by Inventor Wilfred Armstrong

Wilfred Armstrong 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).

  • Publication number: 20050243486
    Abstract: A grounding arrangement (19) for a communication product (10) can include an external conductive surface (12), an internal ground (50), and a frequency selective ground path between the external conductive surface and the internal ground. The frequency selective ground path (54 and/or 56) provides for a high impedance path between the external conductive surface and the internal ground for signals at a predetermined operating frequency range for the communication product and a low inductance path between the external conductive surface and the ground for signals operating at electrostatic frequencies. The internal ground can reside on the surface of a printed circuit board (18) within the communication product and the external conductive surface can be coupled to the internal ground via a spring contact (20) and an inductor (54) or a resonant circuit (54 and 56).
    Type: Application
    Filed: April 30, 2004
    Publication date: November 3, 2005
    Applicant: Motorola, Inc.
    Inventors: William Wingfield, Wilfred Armstrong, Minh Nguyen