Robert L Whitten

US Patent:

D4120388, Jul 13, 1999

Filed:

Jun 30, 1997

Appl. No.:

D/072739

Inventors:

Roland R. Tancrede - Candia NH
Randall D. Brown - Barrington NH
Robert C. Whitten - Loudon NH

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

2604

US Classification:

D26 2

US Patent:

47376775, Apr 12, 1988

Filed:

Nov 7, 1986

Appl. No.:

6/928731

Inventors:

Robert C. Whitten - Pittsfield NH

Assignee:

GTE Products Corporation - Danvers MA

International Classification:

H01J 61073
H01J 6134

US Classification:

313 25

Abstract:

A high pressure sodium vapor discharge lamp of the type having a discharge tube with a feed-through tube and an internal electrode at each end of the tube. An outer envelope encompasses the arc tube and there is an arc tube centering means disposed within the outer envelope and electrically coupled to the arc tube. The arc tube centering means is comprised of a geometric configuration which compensates for thermal expansion differences between the arc tube and the outer envelope during lamp sealing and, more importantly, lamp operation. The arc tube centering means includes a pair of offset lead wires, at least one of which has a twisted loop disposed along its length. The offset lead wires are preferably made of niobium.