Patents by Inventor Gregory J. Sheka

Gregory J. Sheka 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).

  • System and method for providing alternate AC voltage
    Patent number: 5619077
    Abstract: A system and method for providing an alternate AC voltage to an electrical load having a main AC voltage. The system and method include a signal generator for generating a main AC voltage signal representing the value of the main AC voltage, and a processor for processing the main AC voltage signal to determine a status of the main AC voltage, a main AC voltage failure time period, and a main AC voltage restoration time period. The system and method also include a control signal generator for generating a control signal in response to the main AC voltage signal, the main AC voltage failure time period, the main AC voltage restoration time period, and a pre-selected delay time period, and a switch for switching the electrical load between the main AC voltage and the alternate AC voltage in response to the control signal.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: April 8, 1997
    Assignee: Holophane Lighting, Inc.
    Inventors: John D. Green, Gregory J. Sheka, Michael L. Thompson, John B. Hissong, Ming D. Tan