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| Number | Title | Issue Date |
| 7621211 | Force feedback poppet valve having an integrated pressure compensator The force feedback poppet valve includes a valve body having a main chamber, a first port, and a second port. The force feedback poppet valve further includes a main poppet disposed within the main chamber and movable between an open position and a closed position t... | 11/24/2009 |
| 7224195 | Output drive circuit that accommodates variable supply voltages In accordance with the invention, a driver circuit is described that permits a single thin gate oxide process to be utilized where a dual oxide process may normally be necessary. Circuits employing only thin gate oxide devices are used as the design basis for a sing... | 05/29/2007 |
| 4223232 | Battery charging circuit for an emergency system A single active element performs the multiple functions of regulating DC voltage level from an AC source supplied to charge a battery and of coupling the battery to power an emergency system such as an emergency lighting system upon loss of the AC source.... | 09/16/1980 |
