| Patent Number |
Title Of Patent |
Date Issued |
| 5027034 |
Alternating cathode florescent lamp dimmer |
June 25, 1991 |
| An apparatus for use in dimming florescent lamps by alternating cathodes operated with pulsating unidirectional arc currents for a duration that is long relative to the filament thermal time constant, but short in relation to the mercury migration time constant of the florescent lamp. Th |
| 4998045 |
Fluorescent lamp dimmer |
March 5, 1991 |
| A fluorescent lamp dimmer, for use with one or more fluorescent lamps where large ratios of luminous differences are required, which includes apparatus for powering the arc current for the fluorescent lamps from a source of pulsating voltage of variable pulse width and variable frequency |
| 4959594 |
Power saving electromagnetic deflection display system for dual mode deflection amplifier |
September 25, 1990 |
| An electromagnetic deflection display system is operative for bi-directional raster and stroke deflection and provides minimum power dissipation in raster mode during a segmented or patch raster display. Energy stored in the deflection yoke during one direction of the raster scan is |
| 4939423 |
Reduction of effects of beat frequencies in systems with multiple oscillators |
July 3, 1990 |
| Apparatus for reducing the effects of beat frequencies in systems having multiple oscillators wherein a wide band frequency modulator operates to alter the frequency supplied by one of the oscillators at a rate high enough that any beat frequencies occur at rates undetectable to the huma |
| 4677349 |
Self converging deflection yoke for in-line gun color CRT |
June 30, 1987 |
| An apparatus for applying convergence corrections to correct positional and misconvergence errors in a CRT employing a self-converging deflection yoke for magnetic deflection of an inline color gun assembly. Convergence correction coil windings are coupled to the deflection windings with |
| 4131130 |
Pneumatic pressure control valve |
December 26, 1978 |
| A pneumatic control valve of the flapper type for controlling the resultant pneumatic pressure within a chamber from two sources of pressure in proportion to an electrical control signal is disclosed, wherein two flappers, one associated with a nozzle connected with one of said sources |
| 4086804 |
Precision pneumatic pressure supply system |
May 2, 1978 |
| A dual closed loop, precision pneumatic pressure selection, control and display system for use in testing pneumatic apparatus provides precision digital high response analog control of a precision pneumatic valve for establishing, maintaining, and displaying selected reference pressures |
