Patents by Inventor David J. Sawayda

David J. Sawayda 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).

  • Missing phase detector
    Patent number: 4542433
    Abstract: A multiphase imbalance monitor utilizes a resistive summing network for sampling the ac voltage in each phase of the system under consideration. The summing network provides a zero voltage output under normal conditions. When a phase imbalance or missing phase condition occurs, the summing network provides a finite output voltage which can be used to actuate indicating and/or interrupting means.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: September 17, 1985
    Assignee: Sperry Corporation
    Inventors: Martin A. Schaefer, David J. Sawayda