Gte Products Corporation

Gte Sylvania Incorporated

Edmund M Passmore

William M Keeffe

Warren Anderson

George L Duggan

William M Labadini

John Francis Waymouth

Thomas J Patrician

Robert J Karlotski

Simone P Bazin

A metal halide high intensity discharge lamp including a carbon monoxide additive in the arc tube fill to improve lumen maintenance is provided. The metal halide discharge lamp of the present invention comprises: an outer sealed glass envelope; a pair of electrical conductors sealed into and passing through the glass envelope; an arc tube disposed within the outer glass envelope, the arc tube including a pair of spaced electrodes therein with the electrodes being electrically connected to the electrical conductors such that one electrode is electrically connected to one electrical conductor; a chemical fill disposed within the arc tube, the chemical fill comprising mercury, metal halide additives, carbon monoxide, and a starting gas; and a support structure disposed within the outer glass envelope to support the arc tube therein.

Metal halide lamp having CO in gas fill

The present invention provides a tungsten-based duplex composite member, e.g., wire or rod, which combines the emissive, nonsag, or other desirable qualities of an inner tungsten-based core material with a different combination of properties, for example, resistance to attack, by the presence of a different tungsten-based material as an outer sheath or shell surrounding the core material. In one embodiment of the present invention, an electrode is formed from a duplex composite member, composed of a thoriated tungsten core (W-ThO.sub.2) and a thin rhenium (Re) shell. Other embodiments of duplex composite members are provided by thoriated tungsten discharge electrodes in which it is desirable to have two different concentrations of thoria (ThO.sub.2) in the element, a first concentration in the core of the duplex composite member and a second concentration in the shell or surface of the member.

Method of fabricating a composite lamp filament

Metal halide lamp

A metal halide discharge lamp includes an arc tube having a chemical fill, and a pair of electrodes sealed in the arc tube. The electrodes are tungsten and have differing thoria contents. The electrodes with differing thoria contents provide faster starting times than electrodes with equal low thoria contents and eliminate the electrode meltback, voltage increase and lumen loss that is characteristic of electrodes with equal but higher thoria contents. Preferably, one electrode has a thoria content of about 1.5 to 2 weight percent, and the other electrode has a thoria content of about one weight percent or less.

Metal halide discharge lamp with electrodes having unequal thoria

Electrodes for lamps comprising elongated structures comprised of layers containing varying amounts of metal and refractory oxide. In a preferred embodiment the electrode has a first end comprising 9.6 volume percent tungsten or molybdenum and the remainder alumina. The second end comprises substantially 100% tungsten. The intermediate body contains layers of, e.g., 12, 20, 35, 50 and 75% tungsten.

Electrode for high intensity discharge lamps

An electrode, and method of producing same, including tungsten which has been heated in wet hydrogen at 1050.degree. C. for 5 to 10 minutes, then heated at about 1500.degree. C. for about three hours in a vacuum, and then further heated at about 2800.degree. C. for about 5 minutes in a vacuum.

Tungsten electrode and method of producing same

Electrodes for lamps comprising elongated structures comprised of layers containing varying amounts of metal and refractory oxide. In a preferred embodiment the electrode has a first end comprising 9.6 volume percent tungsten and the remainder alumina. The second end comprises substantially 100% tungsten. The intermediate body contains layers of, e.g., 12, 20, 35, 50 and 75% tungsten.

An incandescent lamp comprises a glass envelope having a gas fill, a tungsten filament within the envelope, and getter means comprising carbon and hydrogen disposed within the envelope.

Incandescent lamp getter

One or more pulses of electrical energy are applied to the tungsten wire filament of an incandescent lamp in order to improve lamp performance.

Method of pulsing incandescent lamp filaments

The tungsten wire filament of an incandescent lamp is flashed to a recrystallized structure by applying pulses of electrical energy thereto.

Growing community of inventors

Gloucester, MA, United States of America

Edmund M Passmore