George R Gray

US Patent:

20020109901, Aug 15, 2002

Filed:

Aug 15, 2001

Appl. No.:

09/929896

Inventors:

Seong Suh - Florham Park NJ, US
George Gray - Eldersburg MD, US
Joseph Sluz - Ellicott City MD, US
Edem Ibragimov - Columbia MD, US
Shih-Cheng Wang - Derwood MD, US

International Classification:

G02F001/09

US Classification:

359/281000

Abstract:

Hybrid methods and apparatus for transforming the state of polarization of an electromagnetic wave are provided. The method includes varying both the retardation and the angular rotation of at least one section of a polarization transformer.

US Patent:

39366960, Feb 3, 1976

Filed:

Aug 27, 1973

Appl. No.:

5/391953

Inventors:

George Gray - Lambertville NJ

Assignee:

Lutron Electronics Co., Inc. - Coopersburg PA

International Classification:

H05B 3702

US Classification:

315210

Abstract:

A fluorescent lamp is operated by a-c pulses having a pulse length sufficiently short that the lamp acts like slightly positive impedances. A pulse modulator which produces the pulses has a power transistor biased to saturation. However, varying the base drive of the saturated transistor causes a generally linear change in tube current to permit tube dimming and control. A servo circuit provides feedback control of the base drive to automatically compensate for variable effects to maintain constant tube lighting. Tube dimming is obtained by adjusting the feedback circuits of the servo.

US Patent:

40016374, Jan 4, 1977

Filed:

Jun 12, 1975

Appl. No.:

5/586251

Inventors:

George W. Gray - West Palm Beach FL

Assignee:

Lutron Electronics Co., Inc. - Coopersburg PA

International Classification:

H05B 4116

US Classification:

315205

Abstract:

A ballast circuit for coupling a lamp to an AC power source and having in series between the source and lamp a non-dissipative current limiting capacitor feeding a rectifier, the output of the rectifier being connected to a smoothing filter. The ballast lends itself particularly to use in connection with a dimmer control, and permits the use of a secondary path or bypass around the dimmer control through another capacitor feeding a rectifier formed as a diode bridge, thereby providing a minimum current level path to the lamp.