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:
May. 30, 1989
Filed:
Aug. 24, 1988
Timothy A Benson, Winchester, MA (US);
Peter R Gagnon, Georgetown, MA (US);
GTE Products Corporation, Danvers, MA (US);
Abstract
A high-voltage, low-wattage incandescent lamp having a tubular hard-glass envelope enclosing a coiled coil filament axially mounted with at least one, preferably two, intermediate filamentary supports. The lead-in wires and filamentary supports are mounted in the press seal of the lamp. Each end of the filament is mounted on an internal termination of a lead-in wire. The filament is mounted on the intermediate support(s) at point(s) along the filament body such that the body is divided into approximately equal segments or such that the operating temperature along the body is approximately uniform. Because of reduced filament sag, the tubular glass envelope has a reduced inner diameter and thinner wall thickness whereby the lamp may be more safely contained within an outer envelope in the unlikely event of a lamp burst. A lamp in accordance with the invention will exhibit enhanced operating characteristics and is well suited for applications in Europe.