| Patent Number |
Title Of Patent |
Date Issued |
| 5939837 |
Electronic ballast circuit for independently increasing the power factor and decreasing the crest factor |
Aug. 17, 1999 |
| 5932976 |
Discharge lamp driving |
Aug. 3, 1999 |
| 5933340 |
Frequency controller with loosely coupled transformer having a shunt with a gap and method therefor |
Aug. 3, 1999 |
| 5925982 |
Power supply circuit for intermittently actuating a filament of a vacuum fluorescent display |
Jul. 20, 1999 |
| 5925984 |
Circuit arrangement having LC parallel tuned drive circuitry |
Jul. 20, 1999 |
| 5925986 |
Method and apparatus for controlling power delivered to a fluorescent lamp |
Jul. 20, 1999 |
| 5925989 |
Buck converter switching scheme |
Jul. 20, 1999 |
| 5920155 |
Electronic ballast for discharge lamps |
Jul. 6, 1999 |
| 5917286 |
Pulsed direct current power supply configurations for generating plasmas |
Jun. 29, 1999 |
| 5917287 |
Operating circuit for high-pressure discharge lamps with an ignition-time bridging function |
Jun. 29, 1999 |
| 5917289 |
Lamp ballast with triggerless starting circuit |
Jun. 29, 1999 |
| 5917290 |
Parallel-storage series-drive electronic ballast |
Jun. 29, 1999 |
| 5914569 |
Switching controller and control device for a low pressure fluorescent lamp |
Jun. 22, 1999 |
| 5914570 |
Compact lamp circuit structure having an inverter/boaster combination that shares the use of a first n-channel MOSFET of substantially lower on resistance than its p-channel counterpart |
Jun. 22, 1999 |
| 5914571 |
Method for igniting high frequency operated, high intensity discharge lamps |
Jun. 22, 1999 |
| 5914572 |
Discharge lamp driving circuit having resonant circuit defining two resonance modes |
Jun. 22, 1999 |
| 5910708 |
Gas discharge lamp ballast circuit with complementary converter switches |
Jun. 8, 1999 |
| 5907218 |
Fluorescent lighting assembly with integral ballast |
May. 25, 1999 |
| 5900682 |
Pull chain switch circuit device capable of stepless control of brightness of lighting fixtures of ceiling fan |
May. 4, 1999 |
| 5900701 |
High frequency electronic ballast for lighting |
May. 4, 1999 |
| 5898278 |
Series resonant lamp circuit having direct electrode connection between rectifier and AC source |
Apr. 27, 1999 |
| 5892296 |
Circuit for cyclically driving several loads |
Apr. 6, 1999 |
| 5892327 |
Circuit arrangement for operating a discharge lamp |
Apr. 6, 1999 |
| 5886476 |
Method and apparatus for producing electrical discharges |
Mar. 23, 1999 |
| 5883472 |
Circuit for operating a discharge lamp |
Mar. 16, 1999 |
| 5883473 |
Electronic Ballast with inverter protection circuit |
Mar. 16, 1999 |
| 5880561 |
Discharge lamp operating apparatus and method for reducing discharge arc curvature |
Mar. 9, 1999 |
| 5880562 |
Fluorescent lamp lighting apparatus |
Mar. 9, 1999 |
| 5880564 |
High-frequency operating circuit for a low-pressure discharge lamp with improved electromagnetic compatibility |
Mar. 9, 1999 |
| 5877595 |
High power factor ballast circuit with complementary converter switches |
Mar. 2, 1999 |
| 5874809 |
Constant light output ballast circuit |
Feb. 23, 1999 |
| 5869937 |
High efficiency electronic ballast |
Feb. 9, 1999 |
| 5866989 |
Circuit arrangement for operating a discharge lamp |
Feb. 2, 1999 |
| 5866993 |
Three-way dimming ballast circuit with passive power factor correction |
Feb. 2, 1999 |
| 5861719 |
Regulated power supplies for electroluminescent lamps |
Jan. 19, 1999 |
| 5856728 |
Power transformer circuit with resonator |
Jan. 5, 1999 |
| 5854539 |
Electroluminescent lamp driver circuit with signal tracking |
Dec. 29, 1998 |
| 5844374 |
Inverter arrangement employing resonant capacitive elements directly connected across the switching elements for zero voltage switching |
Dec. 1, 1998 |
| 5844375 |
Dual-inverter type operating circuit for generating two AC signals that are respectively provided to two lamp electrodes of a gas discharge lamp |
Dec. 1, 1998 |
| 5844379 |
Circuit arrangement for igniting a high pressure discharge lamp |
Dec. 1, 1998 |
| 5844380 |
Circuit arrangement for ingniting and supplying power to a lamp |
Dec. 1, 1998 |
| 5838117 |
Ballast circuit with synchronization and preheat functions |
Nov. 17, 1998 |
| 5834902 |
Discharge lamp igniting and operating curcuit having interference signal suppression from 9 KHz to 100 MHz |
Nov. 10, 1998 |
| 5831395 |
Three-way fluorescent adapter |
Nov. 3, 1998 |
| 5831396 |
Circuit arrangement for operating electric lamp |
Nov. 3, 1998 |
| 5828184 |
Lamp ballast drive circuit having a resistor in place of boot strap diode |
Oct. 27, 1998 |
| 5828185 |
High frequency HID lamp system with lamp driven at a frequency above the audible and below the lowest lamp resonant frequency |
Oct. 27, 1998 |
| 5825136 |
Circuit arrangement for operating electric lamps, and an operating method for electronic lamps |
Oct. 20, 1998 |
| 5825138 |
Timing of different phases in an ignition circuit |
Oct. 20, 1998 |
| 5821701 |
Boost regulator circuit with stoarge capacitor for reduced power consumption |
Oct. 13, 1998 |
