Patents by Inventor Andrew L. Stone

Andrew L. Stone 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).

  • Intrinsic safety isolation with capacitive coupling
    Patent number: 9990837
    Abstract: A communication apparatus is provided. The apparatus includes a printed circuit board having a thickness that complies with an intrinsic safety physical separation specification. A first pair of capacitive plates are disposed on opposite sides of the printed circuit board and are arranged to form a first capacitor having an insulating layer of the printed circuit board forming a dielectric material for the first capacitor. A second pair of capacitive plates are disposed on opposite sides of the printed circuit board and are arranged to form a second capacitor having the insulating layer of the printed circuit board forming a dielectric material for the second capacitor. A modulator is coupled to the first and second capacitors and is configured to receive an input signal having an input signal frequency and to provide a modulated signal having a frequency that is higher than the input signal.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: June 5, 2018
    Assignee: Rosemount Inc.
    Inventors: Andrew L. Stone, John A Kielb