Inventor

KEEFFE WILLIAM M

US40 patents

⚠️ This page may combine multiple inventors who share the name “KEEFFE WILLIAM M”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KEEFFE WILLIAM M

GTE PROD CORP

Metal halide discharge lamp with improved color rendering properties

Arc discharge lamp with ultraviolet radiation starting source

Low wattage metal halide lamp

Metal halide arc discharge lamp with means for suppressing convection currents within the outer envelope and methods of operating same

Double-enveloped lamp having a shield surrounding a light-source capsule within a thick-walled outer envelope

Arc discharge lamp with electrodeless ultraviolet radiation starting source

Projection lamp comprising single ended arc discharge lamp and an interference filter

Light-source capsule containment device and lamp employing such device

Method to reduce color temperature variation in metal halide arc tubes

Vertical running, high brightness, low wattage metal halide lamp

Direct current operable arc lamp

Low wattage metal halide arc discharge lamp

Low wattage metal halide arc discharge lamp having optimum efficacy

Metal halide lamp having CO in gas fill

Metal halide lamp

Metal halide lamp having reflective coating on the arc tube

Metal halide discharge lamp for plant growing

Low wattage metal halide discharge lamp electrically biased to reduce sodium loss

Low wattage metal halide lamp with inverted domed sleeve

Metal halide arc discharge lamp with means for suppressing convection currents within the outer envelope and methods of operating and constructing same

Electrode geometry to improve arc stability

High brightness, low wattage, high pressure, metal vapor discharge lamp

Metal-halide lamp having heat redistribution means

Metal-halide lamp having heat redistribution means

Metal halide arc discharge lamp having coiled coil electrodes

Dimpled arc tube having no internal end pockets and a lamp employing same

Low wattage, high pressure metal vapor discharge lamp for minimizing detrimental glow time

High pressure arc discharge lamp having concave shaped outer jacket

Metal halide discharge lamp with arc tube temperature equalizing means

Electrode alignment and capsule design for single-ended low wattage metal halide lamps

Electrode alignment and capsule design for single-ended low wattage metal halide lamps

Metal halide arc discharge lamp having shielded electrode

Arc tube having crystalline press seal penetration suppression means and lamp employing same

High intensity discharge lamp alkali metal loss reduction means

GTE SYLVANIA INC

Metal halide discharge lamp having heat reflective coating

High pressure mercury vapor discharge lamp having improved electrodes

High pressure electric discharge device with hafnium getter

Metal halide discharge lamp having optimum electrode location

GTE LABORATORIES INC

High intensity discharge device containing oxytrihalides

Method of determining condensate location in an HID lamp