Paul G Mathews

US Patent:

6498433, Dec 24, 2002

Filed:

Dec 30, 1999

Appl. No.:

09/475700

Inventors:

Curtis Edward Scott - Mentor OH
Mary Sue Kaliszewski - Lyndhurst OH
Paul George Mathews - Chesterland OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 1716

US Classification:

313636, 313635

Abstract:

An arc discharge lamp, such as a metal halide arc discharge lamp, has an extended life by reducing loss of the metallic portion of the fill. At least one component of the fill reacts with fused silica in the arc tube or diffuses through the arc tube walls. The fill will generally comprise a sodium halide, at least one additional metal halide, and an inert starting gas. A borosilicate glaze which is vitreous and light-transmissive is provided on the wall of the arc tube. The borosilicate glaze is comprised of a borosilicate glass containing at least one metal oxide selected from aluminum, scandium, yttrium, and the rare earth elements. The borosilicate glaze may further contain additional rare earth elements or transition metals to alter the light or energy emission of the lamp by absorbing select wave lengths. For instance, titanium, ceria, cobalt, chromium, iron or neodymium, or combinations of the foregoing, may be added.

US Patent:

53571673, Oct 18, 1994

Filed:

Jul 8, 1992

Appl. No.:

7/910487

Inventors:

Paul G. Mathews - Chesterland OH
Rocco T. Giordano - Garfield Heights OH
Gary R. Allen - Chesterland OH
Timothy P. Dever - Fairview Park OH
Viktor K. Varga - Willoughby Hills OH
Jeffrey D. Johnson - Mentor OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 1710
H01J 6106

US Classification:

313632

Abstract:

A high pressure discharge lamp with a thermally improved anode, as well as a method of making such a lamp, are disclosed. The lamp includes a refractory arc tube with a hermetically sealed arc chamber, a fill in the arc chamber for facilitating light generation, and an anode and a cathode extending into the hermetically sealed arc chamber and being spaced apart from each other. The anode comprises a shank of refractory metal, a cylindrically shaped refractory metal sleeve on a portion of the shank, and an end proximally facing the cathode. The anode end comprises a substantially solid mass of refractory metal, and is integrally joined to both the shank and the metal sleeve to facilitate heat flow from the anode end to the shank and sleeve. The anode end preferably is generally shaped as a hemisphere facing the cathode. The refractory metal sleeve is preferably one or more layers of a helically wound refractory metal wire having an outer diameter more than twice a diameter of the shank.

US Patent:

53878396, Feb 7, 1995

Filed:

Dec 11, 1992

Appl. No.:

7/989301

Inventors:

Rocco T. Giordano - Garfield Heights OH
Jeffrey D. Johnson - Mentor OH
Paul G. Mathews - Chesterland OH
Gary R. Allen - Chesterland OH
Timothy P. Dever - Fairview Park OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 6104

US Classification:

313623

Abstract:

The invention relates to an electrode-inlead assembly for electrical lamps which comprises a lead-in-wire connected to a foil made of refractory metal and the foil is connected to a shank made of refractory metal and supporting the electrode. The object of the invention is, that the shank is made of two parallel rods which are joined by their one end portions, and their opposite end portions are welded to the foil, so that the foil is sandwiched between the rods.

US Patent:

51967596, Mar 23, 1993

Filed:

Feb 28, 1992

Appl. No.:

7/843660

Inventors:

Thomas G. Parham - Gates Mills OH
Robert L. Bateman - Kitty Hawk NC
Gary R. Allen - Chesterland OH
Paul G. Mathews - Chesterland OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01K 132
H01J 6130

US Classification:

313112

Abstract:

Fused quartz containing both titanium dioxide and cerium oxide as UV absorbing dopants has been found to be particularly effective for lamp envelopes for high temperature lamps such as halogen-incandescent lamps and metal halide arc discharge lamps which emit both UV and visible light radiation. The codoped quartz transmits visible radiation and absorbs a substantial portion of the emitted UV radiation. The UV absorption is far superior at temperatures above 500. degree. C. and the codoped quartz does not react with the fill within.

US Patent:

52392309, Aug 24, 1993

Filed:

Mar 27, 1992

Appl. No.:

7/858906

Inventors:

Paul G. Mathews - Chesterland OH
Gary R. Allen - Chesterland OH
Timothy P. Dever - Fairview Park OH
Rocco T. Giordano - Garfield Heights OH
John M. Davenport - Lyndhurst OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 1704
H01J 6102

US Classification:

313571

Abstract:

A high brightness discharge light source includes an arctube having an arc chamber formed therein and in which is disposed a fill of gas energizable to a discharge condition. At least two electrodes extend into the arc chamber and are separated by an arc gap of between 2 and 3. 5 mm. The dose of mercury disposed in the arc chamber and various arc tube dimensions are selected so as to achieve a balance between three constraints including operating voltage thereby defining lamp efficacy, convective stability and structural integrity of the discharge lamp. A balance between arc gap, arc chamber diameter, wall thickness and the mercury density of the lamp yield a discharge lamp which achieves a light output on the order of 50,000 lumens per square centimeter.

US Patent:

55699790, Oct 29, 1996

Filed:

Sep 26, 1994

Appl. No.:

8/312164

Inventors:

Curtis E. Scott - Mentor OH
Cynthia A. Secen - Mentor OH
Thomas G. Parham - Gates Mills OH
Gary R. Allen - Chesterland OH
Robert L. Bateman - Southern Shores NC
Paul G. Mathews - Chesterland OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 1716

US Classification:

313636

Abstract:

Fused quartz containing europium oxide, titanium dioxide and cerium oxide has been found to be effective for absorbing UV radiation while transmitting visible light radiation. Uses for this material include lamp envelopes and shrouds for halogen-incandescent lamps and metal halide arc discharge lamps which emit both UV and visible light radiation.

US Patent:

55980635, Jan 28, 1997

Filed:

Dec 16, 1992

Appl. No.:

7/991603

Inventors:

Paul G. Mathews - Chesterland OH
Martin N. Hassink - Macedonia OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 6136

US Classification:

313623

Abstract:

This lamp comprises an envelope of vitreous light-transmitting material enclosing an internal space, light-generating means within said space, and conductive lead structure projecting into said space and comprising inner and outer lead members and a foil member connected between said lead members. A first portion of the envelope surrounds the foil member and is sealed thereto, and a second portion of the envelope is located inwardly of the first portion. A tubular bead of vitreous material is provided about the inner lead member. This bead fits within the second envelope portion, is joined thereto, and supports the inner lead member in a precise predetermined portion within the envelope. The inner lead member projects inwardly beyond the bead and provides support for the light-generating means.

US Patent:

57083282, Jan 13, 1998

Filed:

Jun 3, 1992

Appl. No.:

7/892857

Inventors:

Paul G. Mathews - Chesterland OH
Brian L. Gordon - Richmond Heights OH
David E. Korow - Stow OH
Martin N. Hassink - Macedonia OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 1716

US Classification:

313573

Abstract:

A metal halide arc discharge lamp rated for not more than 150 watts and 100 volts and which can be operated in either a horizontal or vertical position without a significant change in color temperature or lumen output has an ellipsoidal arc chamber mounted within a nitrogen-containing outer envelope. The arc chamber contains a pair of electrodes, mercury and sodium and scandium iodides and is coated at each end with a heat reflective coating. The chamber aspect ratio, electrode insertion length, metal halide density, coating length and wall loading are defined within narrow ranges.