ROGER HUNT
Broker in Medfield, MA

4925703, May 15, 1990

Dec 22, 1988

7/288660

Anthony F. Kasenga - Towanda PA
A. Gary Sigai - Lexington MA
Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

GTE Products Corporation - Stamford CT

C09K 1159

427215

A manganese activated zinc silicate phosphor and method for producing same is disclosed which comprises dry blending a mixture of components consisting essentially of zinc oxide, silicic acid, a source of manganese, ammonium chloride, ammonium fluoride, tungstic oxide and silica wherein the Zn+Mn/Si mole ratio is from about 1. 95 to about 2. 02, wherein the silica is colloidal and has a surface area of from about 50 to about 410 m. sup. 2 /g, and wherein the colloidal silica makes up from about 0. 01% to about 1. 0% by weight, firing the blend in a nitrogen atmosphere at a temperature of from about 1200. degree. C. to about 1300. degree. C. for a sufficient time to produce the phosphor, and firing the phosphor in air at a temperature of from about 1175. degree. C. to about 1275. degree. C. for a sufficient time to diffuse the tungsten and manganese to the surfaces of the phosphor particles.

4803400, Feb 7, 1989

Feb 2, 1987

7/010078

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

GTE Laboratories Incorporated - Waltham MA

H01J 6304

313489

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.

4956202, Sep 11, 1990

Oct 27, 1989

7/427654

Anthony F. Kasenga - Towanda PA
A. Gary Sigai - Lexington MA
Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

GTE Products Corporation - Danvers MA
GTE Laboratories Incorporated - Waltham MA

C09K 1159

427215

A method for producing manganese activated zinc silicate phosphor wherein the individual phosphor particles are surrounded with a non-particulate, conformal aluminum oxide coating is disclosed. The method comprises dry blending a mixture of components consisting essentially of zinc oxide, silicic acid, a source of manganese, ammonium chloride, ammonium fluoride, tungstic oxide, and silica, wherein the Zn+Mn/Si mole ratio is from about 1. 95 to about 2. 02, wherein the silica is colloidal and has a surface area of from about 50 to about 410 m. sup. 2 per gram, and wherein the colloidal silica makes up from about 0. 01% to about 1. 0% by weight of the mixture; firing the resulting dry blend of components in a nitrogen atmosphere at a temperature of from about 1200. degree. C. to about 1300. degree. C. for a sufficient time to produce the phosphor; milling the resulting phosphor for a period of time of from about 60 minutes to about 120 minutes; firing the resulting milled phosphor in air at a temperature of from about 1175. degree. C.

5714836, Feb 3, 1998

Aug 28, 1992

7/937332

Roger B. Hunt - Medfield MA
Lawrence L. Hope - Maynard MA
William J. Roche - Merrimac MA

GTE Products Corporation - Danvers MA

H01J 162

313487

A fluorescent lamp comprises at least one layer of a quad-phosphor blend for emitting visible illumination having a white color. The quad-phosphor blend comprising a first and second green emitting phosphor component with each green emitting phosphor component having different visible emission spectrum principally in the 520 to 560 nm wavelength range. A third blue emitting phosphor component has an emission spectrum principally in the 440 to 470 nm wavelength range. A fourth red emitting phosphor component has an emission spectrum principally in the 590 to 620 nm wavelength range. The first green emitting phosphor component is a alkaline earth metal activated phosphor and the second green emitting phosphor is a rare earth activated phosphor wherein 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 three of the phosphor components.

4952422, Aug 28, 1990

Feb 29, 1988

7/161643

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

GTE Laboratories Incorporated - Waltham MA

B05D 506, B05D 512

427 67

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.

2006026, Nov 30, 2006

May 24, 2005

10/908726

Paul Salvi - Versailles KY, US
Roger Hunt - Medfield MA, US

OSRAM SYLVANIA INC. - Danvers MA

H01J 1/62, H01J 63/04

313634000, 313635000, 313489000, 313493000

A lamp envelope is provided with an alumina layer and a multilayer phosphor coating on the alumina layer. The phosphor coating includes a top phosphor layer with a first weight percent of rare earth activators and a middle phosphor layer with a second weight percent of rare earth activators. The second weight percent is less than the first weight percent so that a total amount of the activators in the coating is reduced while maintaining a required lamp brightness and color rendering index (CRI). Preferably, the second weight percent is about 50-60% of the first weight percent and the middle layer is about 30-50% of a total weight of the coating so that a total weight of the activators in the coating is no more than about 80% of a weight of the activators in the coating if the first and second weight percents were the same.

8541948, Sep 24, 2013

Dec 1, 2009

13/132081

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

Osram Gesellschaft mit Beschraenkter Haftung - Munich

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

315117, 315134, 313486, 313487, 313640, 313642

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.

6007741, Dec 28, 1999

Aug 19, 1998

9/136671

Roger B. Hunt - Medfield MA
Michael A. Krebs - Montezuma NM

Osram Sylvania Inc. - Danvers MA

C09K 1136, C09K 1178, C09K 1155

2523014R

A method is provided whereby high brightness metaborate phosphors are made by milling the reactants in a saturated aqueous solution of magnesia and boric acid prior to firing. The method increases the homogeneity of the fired metaborate phosphor cake and reduces the tendency of the fired cake to stick to the firing boats.

5039449, Aug 13, 1991

Nov 7, 1988

7/267880

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

GTE Laboratories Incorporated - Waltham MA

C09K 1159, C09K 1168

2523015

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%.

4950948, Aug 21, 1990

Sep 11, 1989

7/406884

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

GTE Laboratories Incorporated - Waltham MA

H01J 6144

313486

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.