Thomas G Parham

US Patent:

6382816, May 7, 2002

Filed:

Dec 23, 1999

Appl. No.:

09/471354

Inventors:

Tianji Zhao - Mayfield OH
Rajasingh Schwartz Israel - Westlake OH
Frederick Walter Dynys - Chagrin Falls OH
Thomas Gene Parham - Livermore CA

Assignee:

General Eectric Company - Schenectady NY

International Classification:

H01J 316

US Classification:

362257, 313635, 362296, 362310, 362341, 362343

Abstract:

A reflector lamp has a generally parabolic shaped housing ( ) with an interior surface coated with a layer ( ) of silver having a protective layer ( ) of a stable protective oxide, such as silica, disposed thereon. An intermediate layer ( ), such as a layer of elemental silicon, protects the silver layer during deposition of the silica layer and is completely or substantially consumed during formation of the silica layer. The lamp includes a light source ( ) having a longitudinal axis (x) disposed on the parabolic reflector axis and preferably disposed outward of the parabolic focus (F). During lamp fabrication, the protective coating is preferably annealed to improve reflectance. The preferred lamp will have a lumens per watt greater than 14.

US Patent:

6773141, Aug 10, 2004

Filed:

Mar 14, 2002

Appl. No.:

10/098772

Inventors:

Tianji Zhao - Mayfield OH
Rajasingh Schwartz Israel - Westlake OH
Frederick Walter Dynys - Chagrin Falls OH
Thomas Gene Parham - Livermore CA

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 316

US Classification:

362257, 362635, 362296, 362310, 362341, 362343

Abstract:

A reflector lamp has a generally parabolic shaped housing ( ) with an interior surface coated with a layer ( ) of silver having a protective layer ( ) of a stable protective oxide, such as silica, disposed thereon. An intermediate layer ( ), such as a layer of elemental silicon, protects the silver layer during deposition of the silica layer and is completely or substantially consumed during formation of the silica layer. The lamp includes a light source ( ) having a longitudinal axis (x) disposed on the parabolic reflector axis and preferably disposed outward of the parabolic focus (F). During lamp fabrication, the protective coating is preferably annealed to improve reflectance. The preferred lamp will have a lumens per watt greater than 14.

US Patent:

6920765, Jul 26, 2005

Filed:

Apr 17, 2002

Appl. No.:

10/125851

Inventors:

Joseph A. Menapace - Livermore CA, US
John E. Peterson - Livermore CA, US
Bernardino M. Penetrante - San Ramon CA, US
Philip E. Miller - Livermore CA, US
Thomas G. Parham - Livermore CA, US
Michael A. Nichols - Livermore CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

C03B037/018
C23B025/00
C23F001/00
C23F015/00
B24B001/00

US Classification:

65392, 65 31, 65 61, 65386, 2504923, 216 80, 216 87, 216 97, 451 57

Abstract:

A method for reducing the density of sites on the surface of fused silica optics that are prone to the initiation of laser-induced damage, resulting in optics which have far fewer catastrophic defects, and are better capable of resisting optical deterioration upon exposure to a high-power laser beam.

US Patent:

55369910, Jul 16, 1996

Filed:

Sep 13, 1994

Appl. No.:

8/305002

Inventors:

Thomas G. Parham - Gates Mills OH
Leonard E. Hoegler - Solon OH
Pamela K. Whitman - Gates Mills OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 516

US Classification:

313113

Abstract:

An electric lamp, such as an incandescent linear quartz heat lamp, is provided having a vitreous light transmissive envelope having an exterior surface and a light source capable of generating light within said envelope. Disposed on a portion of the exterior surface of the envelope is a diffuse reflective coating, such as a boron nitride coating, for reflecting at least a portion of the light emitted by the source. A protective silica coating encapsulates the reflective coating to protect the reflective coating from things such as abrasion, moisture, and cleaning solvents.

US Patent:

56104693, Mar 11, 1997

Filed:

Mar 16, 1995

Appl. No.:

8/405123

Inventors:

Rolf S. Bergman - Cleveland Heights OH
James T. Dakin - Shaker Heights OH
Thomas G. Parham - Gates Mills OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 102
H01J 724
H01J 6140
H01J 516

US Classification:

313 25

Abstract:

An electric lamp includes a sealed outer envelope, an arctube located within the envelope, a shroud separate from the arctube having an ellipsoidally-shaped reflecting portion positioned around the arctube, and a coating disposed on the reflecting section of the shroud for reflecting light having predetermined wavelengths emitted by the arctube. The ellipsoidal shape of the shroud is effective for reflecting the light substantially back toward the arctube. Particularly when the coating is a color correcting coating, the shape of the reflecting section is tailored to maximize reflection of radiation at selected wavelengths back toward the arc of the arctube.

US Patent:

52586898, Nov 2, 1993

Filed:

Dec 11, 1991

Appl. No.:

7/805133

Inventors:

Jon B. Jansma - University Heights OH
Thomas G. Parham - Gates Mills OH
Pamela K. Whitman - Gates Mills OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 0162

US Classification:

313489

Abstract:

Fluorescent lamps having a tin oxide layer protected by a layer of colloidal alumina having a median particle diameter below 0. 4 micron exhibit an objectionable pearlescent coloration if the alumina layer thickness is within the range of 500-8,000. ANG. This coloration is reduced to an acceptable level by incorporating from 10-30 wt. % of particulate alumina having a median diameter above 0. 75 micron in the colloidal alumina.

US Patent:

59527684, Sep 14, 1999

Filed:

Oct 31, 1994

Appl. No.:

8/332317

Inventors:

Jack M. Strok - Garrettsville OH
Gary R. Allen - Chesterland OH
Thomas G. Parham - Gates Mills OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 6134

US Classification:

313110

Abstract:

A metal halide arc tube is provided having a light-transmitting envelope and electrodes for generating an arc discharge within a sealed chamber of the envelope. The envelope includes a transparent film at a cold region of the sealed chamber where metal halides migrate and condense. The transparent film transmits visible radiation and absorbs ultraviolet radiation emitted by the arc to impose an additional heat load on the cold region so that a high metal halide vapor pressure can be maintained. The temperature of a hot region of the envelope can be maintained at a lower level by reducing power input or increasing chamber surface area. Preferably, the transparent film reflects infrared radiation emitted by the light source back to the arc to increase efficiency and further increase the temperature of the cold region due to decreased thermal emittance. The transparent film is preferably a dichroic coating having alternating layers of high and low index of refraction refractory materials.

US Patent:

57239371, Mar 3, 1998

Filed:

Mar 22, 1993

Appl. No.:

8/034316

Inventors:

Pamela K. Whitman - Gates Mills OH
Thomas G. Parham - Gates Mills OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01K 126

US Classification:

313116

Abstract:

A light-scattering coating comprising light-scattering particles, such as alumina, dispersed in a silica matrix is formed by applying to the filter a silicone solution in which is dispersed colloidal silica and the light-scattering particles to a suitable substrate and then pyrolyzing the dispersion at high temperature to drive off the organic components and form the silica matrix. This coating is hard and abrasion resistant and is useful for reflectors, lamps and lenses.