Daniel W Oblas

US Patent:

50813528, Jan 14, 1992

Filed:

Feb 14, 1991

Appl. No.:

7/655887

Inventors:

Gregory P. Maklae - Waltham MA
Daniel W. Oblas - Bedford MA
Donald L. Dugger - Marlboro MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01J 4904

US Classification:

250282

Abstract:

The present invention describes a technique for sample preparation and analysis of ceramics and oxides. The technique involves mixing the ceramic or oxide powder with a conducting powder such as gallium, indium or silver and adding a small amount of dopant. The dopant comprises approximately 5-30% by weight of the sample and is selected from the group comprising thoria, yttria or ytterbia. It is theorized that the addition of the dopant provides a source of electrons that stabilizes the plasma in the glow discharge mass spectrometer which allows for impurity analysis in the part-per-million range.

US Patent:

50276506, Jul 2, 1991

Filed:

May 8, 1990

Appl. No.:

7/520415

Inventors:

Daniel W. Oblas - Bedford MA
Vinod K. Sarin - Lexington MA
Jaime Sanchez - Medellin, CO
Frank E. Sivo - Reading MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

G01N 1904

US Classification:

73150A

Abstract:

A microscratch-test method for measuring adhesion between a first material and a second material adhered to one another at an interface and forming an article. The method involves polishing a planar surface of the article generally normal to the interface and exposing the interface and the first and second materials. A static load of predetermined mass is applied to a starting point on the first or second material in a direction generally normal to the planar surface, using a load means of a third material harder than the first and second materials. The load means is moved across the planar surface from the starting point in a straight line generally toward and across the interface at an angle relative to the interface of between 90. degree. and about 20. degree. These steps are repeated, varying the mass.

US Patent:

42439094, Jan 6, 1981

Filed:

Jan 5, 1979

Appl. No.:

6/001117

Inventors:

Charles Brecher - Lexington MA
Daniel W. Oblas - Bedford MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01J 6304
H01J 6163

US Classification:

313487

Abstract:

Improved fluorescent lamps utilize phosphors which comprise a major amount of a particulate phosphor such as a cool white alkaline earth halophosphate coated with a minor amount of a protective coating consisting of NaCs. sub. 2 PrCl. sub. 6.

US Patent:

46042768, Aug 5, 1986

Filed:

Sep 19, 1983

Appl. No.:

6/533512

Inventors:

Daniel W. Oblas - Bedford MA
Sophia R. Su - Weston MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

C01B 3102
H01B 106

US Classification:

423449

Abstract:

A method and apparatus for intercalating small graphite flakes with a metal halide. Graphite and a metal halide are placed in two chambers 12, 14 of a rotary vapor transport reactor assembly 10 and heated. The reactor is charged with a halogen gas and rotated by motor 24 during synthesis to produce a homogenous and uniform intercalated product.