| Patent Number |
Title Of Patent |
Date Issued |
| 5388357 |
Kit using led units for retrofitting illuminated signs |
February 14, 1995 |
| A kit retrofits a conventional exit sign, which normally uses internally mounted incandescent or fluorescent lamps, to operate using multiple LED sources in a group or assembly on a board. Indicia lighting is accomplished substantially indirectly through reflection of light from the |
| 5214352 |
Light dimming system for emergency operation |
May 25, 1993 |
| An emergency lighting system utilizing standard nonemergency circuitry to provide power to all of the light fixtures in a facility during a power failure. This emergency lighting system uses an electronic inverter to convert d.c. power stored in batteries to either a high or low frequenc |
| 4388534 |
Uninterruptible power supply |
June 14, 1983 |
| An interruptible power supply can supplant a primary power source with a secondary power source such as a battery when the primary power source fails. The supply has a switching device, an inverter and a pair of output terminals. The inverter is coupled to the output terminals. The inver |
| 3946301 |
Direct current to alternating current electronic inverter with overload and short-circuit protec |
March 23, 1976 |
| A high-efficiency, low-cost D.C. to A.C. electronic inverter generates sinusoidal ouptut voltage(s) by utilization of an oscillator and divider circuitry that generates extremely precise symmetrical control signals. These control signals cause a push-pull amplifier comprising power switc |
