Dale E Benjamin

US Patent:

6361864, Mar 26, 2002

Filed:

Feb 2, 1999

Appl. No.:

09/243674

Inventors:

Chen-Wen Fan - Sayre PA
Richard G. W. Gingerich - Towanda PA
Dale E. Benjamin - Athens PA

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

C09K 1165

US Classification:

428403, 428404, 2523014 R, 427 64, 427212, 427215, 427217

Abstract:

A method of coating phosphor particles by chemical vapor deposition. The phosphors are coated by introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a coating precursor which includes carbon into the reaction vessel for a time sufficient to saturate the phosphor particles with the precursor; continuing precursor flow into the reaction vessel; introducing an oxygen/ozone mixture into the reaction vessel, the oxygen/ozone mixture comprising less than 4. 4 wt. % ozone; and maintaining the inert gas flow, oxygen/ozone mixture flow and further precursor supply for a time sufficient to coat the phosphor particles. The process produces phosphors having from 2200 to 6300 ppm of carbon on the coating and provides lamp efficacys of greater than 6. 1 lm/watt.

US Patent:

6426115, Jul 30, 2002

Filed:

May 15, 2000

Appl. No.:

09/570965

Inventors:

Chen-Wen Fan - Sayre PA
Richard G. W. Gingerich - Towanda PA
Dale E. Benjamin - Athens PA

Assignee:

OSRAM SYLVANIA Inc. - Danvers MA

International Classification:

C23C 1622

US Classification:

427212, 427215, 427217, 427 64, 428403, 428404, 2523014 R

Abstract:

A method of coating phosphor particles by chemical vapor deposition. The phosphors are coated by introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a coating precursor which includes carbon into the reaction vessel for a time sufficient to saturate the phosphor particles with the precursor; continuing precursor flow into the reaction vessel; introducing an oxygen/ozone mixture into the reaction vessel, the oxygen/ozone mixture comprising less than 4. 4 wt. % ozone; and maintaining the inert gas flow, oxygen/ozone mixture flow and further precursor supply for a time sufficient to coat the phosphor particles. The process produces phosphors having from 2200 to 6300 ppm of carbon on the coating and provides lamp efficacys of greater than 6. 1 lm/watt.

US Patent:

6686043, Feb 3, 2004

Filed:

Oct 17, 2000

Appl. No.:

09/690222

Inventors:

Chen-Wen Fan - Sayre PA
Richard G. W. Gingerich - Towanda PA
Dale E. Benjamin - Athens PA

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

B32B 516

US Classification:

428403, 428404, 427 64, 427 68, 427 70, 427213, 427215, 42725523, 42725531, 42725534

Abstract:

A method of coating phosphor particles comprises introducing an inert gas into a reaction vessel and charging phosphor particles into the reaction vessel. The reaction vessel is then heated to a reaction temperature and a coating precursor is introduced while the temperature is maintained for a time sufficient to saturate the phosphor particles with the precursor. Thereafter, continuous precursor is introduced into the reaction vessel, along with an oxygen/ozone mixture. The inert gas flow, oxygen/ozone mixture flow and further precursor are supplied for a time sufficient to coat the phosphor particles.

US Patent:

6733826, May 11, 2004

Filed:

Sep 26, 2001

Appl. No.:

09/963964

Inventors:

Chen-Wen Fan - Sayre PA
Dale E. Benjamin - Athens PA

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

B05D 700

US Classification:

427213, 118716, 118717, 118DIG 5, 118303

Abstract:

A process for preparing particles of zinc sulfide-based electroluminescent phosphor having a moisture resistant coating thereon which comprises the steps of selecting a reaction vessel having a given height and a porous disc at the bottom thereof; charging the reaction vessel with phosphor particles and fluidizing the particles by introducing an inert gas into the vessel through the porous disc; heating the reaction vessel to a reaction temperature; introducing a coating precursor into the reaction vessel at a position adjacent the bottom of the vessel but above the disc; introducing a co-reactant into the reaction vessel at a position substantially mid-way of the given height; and maintaining the inert gas flow, the precursor flow and the co-reactant flow for a time sufficient for a reaction to occur and coat the phosphor with the moisture resistant coating. Apparatus for carrying out the process is also disclosed.

US Patent:

6849297, Feb 1, 2005

Filed:

Nov 15, 2000

Appl. No.:

10/110982

Inventors:

Chen-Wen Fan - Sayre PA, US
Kenneth T. Reilly - Towanda PA, US
Richard G. W. Gingerich - Towanda PA, US
Dale E. Benjamin - Athens PA, US

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

C23C 1640
B05D 506

US Classification:

427215, 427 64, 42725531, 42725534

Abstract:

A process for making an electroluminescent phosphor having a given emission spectra A, comprises the steps of manufacturing a beginning electroluminescent phosphor having an emission spectra B, different than A. A coating is applied to the phosphor having the emission spectra B to increase the resistance of the phosphor to the deleterious effects of moisture and change the emission spectra of the phosphor to emission spectra A. The application of the coating includes the steps of reacting a coating precursor with a mixture of oxygen and ozone.

US Patent:

6918963, Jul 19, 2005

Filed:

Jan 29, 2004

Appl. No.:

10/767245

Inventors:

Chen-Wen Fan - Sayre PA, US
Dale E. Benjamin - Athens PA, US

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

C16C016/00
C23C016/442

US Classification:

118716, 118DIG 5

Abstract:

A process for preparing particles of zinc sulfide-based electroluminescent phosphor having a moisture resistant coating thereon which comprises the steps of selecting a reaction vessel having a given height and a porous disc at the bottom thereof; charging the reaction vessel with phosphor particles and fluidizing the particles by introducing an inert gas into the vessel through the porous disc; heating the reaction vessel to a reaction temperature; introducing a coating precursor into the reaction vessel at a position adjacent the bottom of the vessel but above the disc; introducing a co-reactant into the reaction vessel at a position substantially mid-way of the given height; and maintaining the inert gas flow, the precursor flow and the co-reactant flow for a time sufficient for a reaction to occur and coat the phosphor with the moisture resistant coating. Apparatus for carrying out the process is also disclosed.

US Patent:

7833437, Nov 16, 2010

Filed:

Jan 12, 2007

Appl. No.:

11/622523

Inventors:

Chen-Wen Fan - Sayre PA, US
Tuan A. Dang - Sayre PA, US
Joan M. Coveleskie - Sayre PA, US
Frank A. Schwab - Towanda PA, US
Dale E. Benjamin - Athens PA, US
David C. Sheppeck - Sayre PA, US

Assignee:

Global Tungsten & Powders Corp. - Towanda PA

International Classification:

C09K 11/02
C09K 11/58

US Classification:

2523016S, 428403, 428404, 427212, 427213, 427215

Abstract:

The present invention is an electroluminescent phosphor wherein each individual phosphor particle is encapsulated in an inorganic coating applied by an atomic layer deposition (ALD) coating method. In a preferred embodiment, the coating is aluminum oxyhydroxide. The encapsulated phosphor shows an extreme insensitivity to atmospheric moisture and suffers only minor loss of initial brightness in lamps.

US Patent:

7989064, Aug 2, 2011

Filed:

Jan 9, 2006

Appl. No.:

11/306706

Inventors:

Hans-Joachim Lunk - Towanda PA, US
Ricky D. Morgan - Milan PA, US
Henry J. Stevens - Athens PA, US
Dale E. Benjamin - Athens PA, US
Tuan A. Dang - Sayre PA, US
Timothy A. Frisk - Towanda PA, US

Assignee:

Global Tungsten & Powders Corp. - Towanda PA

International Classification:

B32B 5/16

US Classification:

428403, 428404

Abstract:

The coating the tungsten powder particles with a ceramic barrier suppresses the leachability of tungsten in aqueous media. Preferably, the ceramic coating substantially encapsulates each particle of tungsten and has a thickness of at least about 30 nm and, more preferable, from about 200 nm to about 500 nm. Examples of ceramic coatings that may be used include, but are not limited to, aluminum oxide (alumina), aluminum oxyhydroxide (AlOOH), zirconium oxide (zirconia), cerium oxide (ceria), hafnium oxide (hafnia), and magnesium oxide (magnesia).