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:
Jun. 10, 2003
Filed:
Sep. 26, 2001
Michael R. Kling, Lexington, KY (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
An electric lamp is provided which includes a sealed thin-walled outer envelope containing a fill gas having a high thermal conductivity. A lamp capsule is contained within the outer envelope and is in series with an oxidizable fuse also contained within the outer envelope. The fill gas serves to reduce the temperature of the fuse during normal operation of the lamp thereby reducing the power loss in the fuse, increasing overall lamp efficacy and eliminating glow of the fuse. The lamp capsule is quickly extinguished if the outer envelope is broken and the fuse exposed to air. In one embodiment, an incandescent lamp is provided wherein the lamp capsule is a tungsten halogen capsule, the fuse is a tungsten coil wire and the fill gas is helium.