John M Pugh

US Patent:

42914442, Sep 29, 1981

Filed:

Aug 28, 1978

Appl. No.:

5/937545

Inventors:

Lewis V. McCarty - Cleveland Heights OH
John W. Pugh - Gates Mills OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

B21F 304
B21F 4500

US Classification:

29 2514

Abstract:

An electric lamp filament of tungsten is disclosed that has been coiled and heat-treated to at least 1600. degree. C. on a wire mandrel containing molybdenum but which is essentially free of molybdenum contamination. A barrier layer of tungsten or tantalum is provided on said mandrel to preclude the molybdenum contamination and the coated mandrel can thereafter be dissolved from the uncontaminated tungsten filament coil in an acid mixture.

US Patent:

50721470, Dec 10, 1991

Filed:

May 9, 1990

Appl. No.:

7/521201

Inventors:

John W. Pugh - Gates Mills OH
Donald L. Bly - Chagrin Falls OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01K 102

US Classification:

313341

Abstract:

Improved tungsten coil filaments having good sag resistance and useful in double ended, high intensity and energy efficient tungsten halogen lamps having an IR reflecting filter on the filament chamber. These coil filaments have a microstructure which is a large, elongated and interlocking grain structure produced by a high temperature heat treatment process.

US Patent:

44158300, Nov 15, 1983

Filed:

Aug 31, 1981

Appl. No.:

6/298073

Inventors:

John W. Pugh - Gates Mills OH
Francis W. Pikus - Cleveland Heights OH
James A. Graves - Highland Heights OH
John E. McMillan - Kirtland OH
John L. Walter - Scotia NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 550

US Classification:

313331

Abstract:

An improved inlead construction for an electric lamp is disclosed which utilizes an iron alloy containing sufficient silicon to avoid transformation of the inlead from the alpha ferrite phase to the gamma austenite phase at lamp operation temperatures. This precludes debilitating deformation of the inlead wires caused by on-off cycling of the lamp and concomitant cycling of the wire through the alpha to gamma transformation range. Such deformation can lead to structural or operational failure if the inleads become disconnected or electrically shorted from the resistive filament during lamp operation. In a preferred lamp construction, a pair of the improved inlead wires serve as the sole means of physical support for a resistive incandescent filament directly connected thereto and said inlead wires can further be coated with a dissimilar metal for higher lamp loading requirements in order to help avoid iron migration which can produce deterioration of the resistive incandescent filament.