The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 1983
Filed:
Jun. 03, 1981
Francis R Koza, Salem, NH (US);
Richard A Parrott, Merrimack, NH (US);
GTE Products Corporation, Stamford, CT (US);
Abstract
A high pressure sodium vapor discharge lamp having an arc tube coaxially mounted within an outer glass envelope by means including a coiled spring engaging one end of the arc tube and coaxially disposed in the partially compressed state between that end of the arc tube and a dome portion of the outer envelope. In one embodiment the dome of the outer envelope is disk-shaped and a large diameter end of the coiled spring bearing against the dome is constrained in a coaxially centered position by the sidewalls of the outer envelope. In another embodiment, the dome of the outer envelope is provided with an inwardly projecting dimple about which the coiled spring is coaxially fitted to provide self-centering of the arc tube. The partially compressed spring compensates for arc tube length variations and thermal expansion. Mount shadows are reduced by connecting the remote terminal of the arc tube to a lead-in conductor through a fine diameter helically bent wire extending through the outer envelope beyond the length of the arc tube.