Roger Hunt

US Patent:

8541948, Sep 24, 2013

Filed:

Dec 1, 2009

Appl. No.:

13/132081

Inventors:

Armin Konrad - Grossaitingen, DE
Roger Hunt - Medfield MA, US
Martin Zachau - Geltendorf, DE
Ralph Hoeck - Friedberg, DE

Assignee:

Osram Gesellschaft mit Beschraenkter Haftung - Munich

International Classification:

H05B 41/36
H01J 61/52
H01J 1/63

US Classification:

315117, 315134, 313486, 313487, 313640, 313642

Abstract:

An operating device for operating at least one Hg low-pressure discharge lamp which has a first and a second electrode coil may include a unit for providing a variable that is correlated with the Hg vapor pressure in the at least one Hg low-pressure discharge lamp comprises at least one unit for capturing emission spectra of at least specifiable spectral ranges, wherein the unit for capturing emission spectra may include at least one light receiving unit which is arranged in the beam path of the at least one Hg low-pressure discharge lamp.

US Patent:

48063894, Feb 21, 1989

Filed:

Mar 2, 1987

Appl. No.:

7/020972

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

B05D 512

US Classification:

427 67

Abstract:

A method for preventing the hydration/solubilization of the protective oxide coating of a phosphor is described. The method involves coating of the oxide coated phosphor particles with a continuous hydrophobic coating. After the phosphor particles are coated with the continuous hydrophobic coating and the continuous hydrophobic coating cured, they are added to a water-based suspension and subsequently processed into a lamp.

US Patent:

49509489, Aug 21, 1990

Filed:

Sep 11, 1989

Appl. No.:

7/406884

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA
A. Gary Sigai - Lexington MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01J 6144

US Classification:

313486

Abstract:

A new and improved manganese activated zinc silicate phosphor is described. The phosphor has cations consisting essentially of zinc, silicon, manganese, and tungsten. The phosphor has an absolute reflectance less than or equal to 13. 5% at 275 nm, an absolute reflectance equal to or greater than 80% at 350 nm, and a surface area from about 0. 3 m. sup. 2 /gm to about 0. 4 m. sup. 2 gm.

US Patent:

49524224, Aug 28, 1990

Filed:

Feb 29, 1988

Appl. No.:

7/161643

Inventors:

Romano G. Pappalardo - Sudbury MA
Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

B05D 506
B05D 512

US Classification:

427 67

Abstract:

A fluorescent lamp containing a Y. sub. 2 O. sub. 3 or Al. sub. 2 O. sub. 3 coating on a layer of yttrium vanadate phosphor and a method of coating the layer of the yttrium vanadate phosphor with a continuous protective coating of Y. sub. 2 O. sub. 3 or Al. sub. 2 O. sub. 3 is described. The method comprises applying a coating of a metal, such as yttrium or aluminum, on the yttrium vanadate phosphor then lehring the metallic coating at about 500. degree. C. to about 625. degree. C. to form a continuous protective coating of Y. sub. 2 O. sub. 3 or Al. sub. 2 O. sub. 3 overlaying the layer of phosphor.

US Patent:

50394495, Aug 13, 1991

Filed:

Nov 7, 1988

Appl. No.:

7/267880

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA
A. Gary Sigai - Lexington MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

C09K 1159
C09K 1168

US Classification:

2523015

Abstract:

A new and improved method of treating a manganese activated zinc silicate phosphor is described. The method comprises heating a manganese activated zinc silicate phosphor powder having cations consisting essentially of zinc, silicon, manganese, and tungsten and having a 350 nm reflectance less than 80% and a 275 nm reflectance greater than 13. 5% to a temperature of about 1225. degree. C. in air. The phosphor powder is then cooled to room temperature and wet milled in an acid solution. The phosphor powder is then separated from the acid solution washed in water and dried to form a dry phosphor powder having a 350 nm reflectance equal to or greater than 80% and a 275 nm reflectance equal to or less than 13. 5%.

US Patent:

48034002, Feb 7, 1989

Filed:

Feb 2, 1987

Appl. No.:

7/010078

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01J 6304

US Classification:

313489

Abstract:

A method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the oxide coating of a phosphor is described. The method involves the annealing of the oxide coated phosphor at a temperature and for a period sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After annealing the phosphor is cooled and then added to a water-based suspension. The optimum conditions for annealing a manganese activated zinc silicate phosphor or a calcium halophosphate phosphor having a protective aluminum oxide coating are the combination of a temperature between about 700. degree. C. and about 850. degree. C. and for a period of time from about 15 minutes to about 20 hours.

US Patent:

6137217, Oct 24, 2000

Filed:

Aug 28, 1992

Appl. No.:

7/937936

Inventors:

Romano G. Pappalardo - Sudbury MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Products Corporation - Danvers MA

International Classification:

H01J 162

US Classification:

313487

Abstract:

A fluorescent lamp comprises at least one layer of a four-component phosphor blend for producing visible illumination having a white color. The quad-phosphor blend comprising a first and second red-emitting phosphor component with each red-emitting phosphor component having different visible emission spectrum principally in the 590 to 630 nm wavelength range. A third blue-emitting phosphor component has an emission spectrum principally in the 430 to 490 nm wavelength range. A fourth no-rare-earth green-emitting phosphor component has an emission spectrum principally in the 500 to 570 nm wavelength range. The relative proportions of the phosphor components are such that an enhanced color rendering index is produced as compared to tri-component blends formed from only three of the phosphor components.

US Patent:

49798936, Dec 25, 1990

Filed:

Feb 21, 1989

Appl. No.:

7/312799

Inventors:

Romano G. Pappalardo - Sudbury MA
Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

B05D 506
B05D 512

US Classification:

427 67

Abstract:

The lumen maintenance of fluorescent lamps containing yttrium vanadate phosphors is markedly improved by the presence of a protective oxide layer for the phosphor. The protective oxide layer is produced by evaporating aluminum isopropoxide, in a vacuum, over phorphor particles forming a continuous aluminum isopropoxide over the phosphor particles. The isopropoxide coating is subsequently oxidized by lehring the phosphor at a temperature from about 500. degree. C. to 625. degree. C. forming an alumina coating on the phosphor particles.