Patents by Inventor Howard R. Bobry

Howard R. Bobry 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).

  • Power back feed protection device
    Patent number: 5029285
    Abstract: In a backup power supply, a pair of back-to-back auxiliary transformers are used to isolate the inverter control source, the inverter, and the a.c. line. A single-pole double-throw relay is used to selectably connect the a.c. line to the power supply or the auxiliary transformers to each other. When the auxiliary transformers are connected, the inverter operates and the a.c. line is isolated from the power supply and no power can feed back from the power supply to the a.c. lines. When the a.c. line is connected to the power supply, the auxiliary transformers are unconnected and the inverter is inoperative.
    Type: Grant
    Filed: April 20, 1990
    Date of Patent: July 2, 1991
    Assignee: Albar, Inc.
    Inventor: Howard R. Bobry