Patents by Inventor Albert B. Lester

Albert B. Lester 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).

  • Current sensor responsive to symmetrical and asymmetrical currents and current limiting protector utilizing same
    Patent number: 4443854
    Abstract: A current limiting protector for use in electric power transmission lines includes a conductive strip of material and a chemical charge for physically interrupting the conductive strip in response to a fault current. A current sensor triggers the chemical charge when the line current is symmetrical and the RMS value of the line current exceeds a first value, and the current sensor triggers the chemical charge when the line current is asymmetrical and the RMS value of line current exceeds a second value.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: April 17, 1984
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Herbert M. Pflanz, Albert B. Lester