1
Frederick A Stich, Thomas G Hubert, David L Layden, Donald K Zahrte: Uninterruptible power system. Best Power Technology Incorporated, Foley & Lardner, February 11, 1997: US05602462 (281 worldwide citation)

An uninterruptible power system has a transformer with a primary connected to input terminals, a secondary connected to output terminals, a static switch connected between the input terminals and the primary, and an auxiliary primary connected to an inverter which is supplied by a battery to provide ...


2
Frederick A Stich, Donald K Zahrte Sr, Richard V Baxter Jr, Douglas C Folts, Thomas G Hubert, Juan M Medina, William J Hazen, Edward G Beistle: Back-up uninterruptible power system. Best Power Technology, Foley & Lardner, May 24, 1994: US05315533 (150 worldwide citation)

A back-up uninterruptible power system has a power supply path from input terminals connected to AC power system lines to normally supply power to a load. Upon the occurrence of a line fault, a static switch in the power supply path interrupts the connection between the AC power lines and the load a ...


3
Frederick A Stich, Thomas G Hubert, Timothy Walsh: Method and apparatus for adaptive and corrective determination of battery run-time in uninterruptible power systems. General Signal Power Systems, Foley & Lardner, March 25, 1997: US05615129 (14 worldwide citation)

The run-time available from an uninterruptible power system is accurately determined both during supply of power from the battery to the load and during the time where power is supplied directly from an AC power system to the load. During power outages, where power is supplied from the battery throu ...


4
Thomas G Hubert, Frederick A Stich, William J Hazen, Ricky Mills: Front panel unit for electronic equipment. Best Power Technology, Foley & Lardner, November 3, 1992: US05160832 (9 worldwide citation)

A front panel unit for allowing user communication with electronic equipment includes an injection molded plastic front panel which has integrally formed keys which include are each connected by a spring strip to the body of the front panel. These keypads are depressed by a user and engage microswit ...