Susan Mcgee

US Patent:

60377143, Mar 14, 2000

Filed:

Dec 29, 1995

Appl. No.:

8/581236

Inventors:

Vivek Mehrotra - Rye Brook NY
Thomas F. McGee - Peekskill NY
Susan McGee - Peekskill NY
Jeroen Langevoort - Gulpen, NL
Edward Young - Maastricht, NL

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

H01J 6109
H01J 6178

US Classification:

313631

Abstract:

Novel emitter materials, electrode assemblies amd lamps comprising the same are provided in which, in accordance with the invention, novel electrodes are provided having a lamp electrode structure, preferably including a hollow ferrule for sealing in a lamp to permit evacuation; an emitter material of the invention on at least one surface thereof, preferably on a protrusion attached to the hollow ferrule; a thermal isolator, preferably in the form of a low thermal conductivity wire or an incised or cut-out portion of the hollow ferrule body, for thermally isolating the protrusion from the ferrule to maintain a sufficiently high temperature for thermionic emission, and further comprising an emitter material requiring no in-lamp processing. The emitter materials are a mixed oxide of Ba, Sr and mixtures thereof with one or more of the metals from the series comprising Ta, Ti, Zr, Sc, Y, and La, are preferably selected from the group consisting of Ba. sub. 4 Ta. sub. 2 O. sub. 9, Ba. sub. 5 Ta. sub. 4 O. sub. 15, BaY. sub. 2 O. sub. 4, BaCeO. sub. 3, Ba. sub. x Sr. sub. 1-x Y. sub. 2 O. sub. 4, Ba. sub. 2 TiO. sub. 4, BaZrO. sub. 3, Ba. sub. x Sr. sub. 1-x TiO. sub. 3, and Ba. sub. x Sr. sub. 1-x ZrO. sub.

US Patent:

59820977, Nov 9, 1999

Filed:

Dec 29, 1995

Appl. No.:

8/581237

Inventors:

Vivek Mehrotra - Rye Brook NY
Thomas F. McGee - Peekskill NY
Susan McGee - Peekskill NY
Jeroen Langevoort - Gulpen, NL
Edward Young - Maastricht, NL

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

H01J 6104

US Classification:

313631

Abstract:

Novel emitter materials, electrode assemblies amd lamps comprisinfg the same are provided in which, in accordance with the invention, novel electrodes are provided having a lamp electrode structure, preferably including a hollow ferrule for sealing in a lamp to permit evacuation; an emitter material of the invention on at least one surface thereof, preferably on a protrusion attached to the hollow ferrule; a thermal isolator, preferably in the form of a low thermal conductivity wire or an incised or cut-out portion of the hollow ferrule body, for thermally isolating the protrusion from the ferrule to maintain a sufficiently high temperature for thermionic emission, and further comprising an emitter material requiring no in-lamp processing. The emitter materials are a mixed oxide of Ba, Sr and mixtures thereof with one or more of the metals from the series comprising Ta, Ti, Zr, Sc, Y, and La, are preferably selected from the group consisting of Ba. sub. 4 Ta. sub. 2 O. sub. 9, Ba. sub. 5 Ta. sub. 4 O. sub. 15, BaY. sub. 2 O. sub. 4, BaCeO. sub. 3, Ba. sub. x Sr. sub. 1-x Y. sub. 2 O. sub. 4, Ba. sub. 2 TiO. sub. 4, BaZrO. sub. 3, Ba. sub. x Sr. sub. 1-x TiO. sub. 3, and Ba. sub. x Sr. sub. 1-x ZrO. sub. 3, wherein x ranges from a value of 0 to 1, and are most preferably one or more mixed oxides selected from the group consisting of Ba. sub. 4 Ta. sub. 2 O. sub. 9, BaY. sub. 2 O. sub. 4, BaCeO. sub. 3, Ba. sub. 5 Sr. sub. 5 Y. sub. 2 O. sub. 4, Ba. sub. 75 Sr. sub. 25 Y. sub. 2 O. sub. 4, Ba. sub. 2 TiO. sub. 4, BaZrO. sub. 3, Ba. sub. 5 Sr. sub. 5 TiO. sub. 3, and Ba. sub. 5 Sr. sub. 5 ZrO. sub. 3.

US Patent:

57449058, Apr 28, 1998

Filed:

Aug 19, 1997

Appl. No.:

8/916747

Inventors:

Vivek Mehrotra - Rye Brook NY
Hemant S. Betrabet - Veldhoven, NL
David Robert Woodward - Morgantown WV
Thomas O. Leyh - Bridgeport WV
Susan McGee - Peekskill NY

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

H01J 162
H01J 6304
H01J 1720
H01J 6112

US Classification:

313491

Abstract:

The present invention is directed to new electrode structures for use in fluorescent lamps in which a tungsten base structure is provided with electron emissive materials including one or more of barium titanate, barium zirconate, barium strontium zirconate, barium cerium oxide, barium tantalate, and barium strontium yittrium oxide. Amounts of MgO may be added to improve or change emitter properties. A composite electrode structure can be formed by way of coating a tungsten coil with a slurry of this material, or providing powdered mixtures of both the electron emissive material and tungsten material and sintering this powdered material into a high density composite electrode structure.

US Patent:

58474986, Dec 8, 1998

Filed:

Dec 23, 1994

Appl. No.:

8/363184

Inventors:

Vivek Mehrotra - Rye Brook NY
Hemant S. Betrabet - Veldhoven, NL
Susan McGee - Peekskill NY
Thomas F. McGee - Peekskill NY

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

H01J 114
H01J 1906

US Classification:

313352

Abstract:

Composite sintered electrodes with improved properties that make them suitable for use in a variety of lamp types, are provided which comprise a refractory metal and a substantial amount of a refractory emitter oxide, either single layer or multiple layer, the composites having been subjected to sintering at an elevated temperature effective to form a composite electrode having a density of at least 85%, preferably in the presence of a sintering activator, such as for example, Ni, or mixture thereof with a sintering aid such as, for example, Li. sub. 2 O.

US Patent:

58474978, Dec 8, 1998

Filed:

Apr 3, 1997

Appl. No.:

8/832895

Inventors:

Vivek Mehrotra - Rye Brook NY
Hemant S. Betrabet - Veldhoven, NL
Susan McGee - Peekskill NY
Thomas F. McGee - Peekskill NY

Assignee:

Philips Electronics North America Corporation - New York NY

International Classification:

H01J 61067

US Classification:

313346DC

Abstract:

Lamps that include composite sintered electrodes with improved properties that make them suitable for use in a variety of lamp types, are provided by a method for producing electrodes which comprise a refractory metal and a refractory emitter oxide, either single layer or multiple layer, the composites having been subjected to sintering at an elevated temperature effective to form a composite electrode having a density of at least 85%, preferably in the presence of a sintering activator, such as for example, Ni, or mixture thereof with a sintering aid such as, for example Li. sub. 2 O.