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:
Jan. 02, 1979
Filed:
Oct. 13, 1977
Ralph E Newton, Dover, NJ (US);
Henry M Nixon, Westfield, NJ (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
Protection against potentially destructive arcs which may occur within a gas-filled incandescent lamp when the energized filament fails is achieved by partly embedding separate inner and outer lead-in conductors in an hermetic seal that is formed on one end of the lamp envelope and electrically connecting the conductors by a short uncoiled fuse element that is located within the confines of the envelope and has both of its ends embedded in the seal. In the case of halogen-cycle type lamps that have long useful design lives (in the order of 2000 hours) and press-sealed envelopes, the fuse element comprises a tungsten wire that has a diameter which is more than 10% (and up to about 20%) larger than the diameter of the filament wire and has its ends welded to a pair of molybdenum foil conductors that are embedded in the press seal and connect the fuse wire to the inner and outer lead-in conductors. Reliable arc-suppression is thus achieved in a practical and inexpensive manner with rugged sealed-in components that are readily welded together and made integral parts of the finished lamps.