Patents by Inventor Nora A. Lund

Nora A. Lund 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).

  • Overcurrent circuit interrupter using RMS sampling
    Patent number: 4685024
    Abstract: An electronic overcurrent circuit interrupter utilizes a digital processor for performing RMS sampling of circuit current for comparison to stored long time and short time current values and time delays before tripping the breaker. A magnetic core current transformer is employed for providing an output current signal to the digital processor. Upon detecting core saturation, which occurs at high currents, an analog detection circuit interrupts the RMS sampling and causes the digital processor to time out the shortest pre-selected time delay before tripping the breaker.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: August 4, 1987
    Assignee: General Electric Company
    Inventors: Paul T. Martellock, John J. Dougherty, Nora A. Lund