Patent ID: 8525409
Filing Date: 2013-09-03
Classification: H01K

Abstract:
1. A lamp comprising: a light transmissive envelope comprising two spaced apart, connected elliptical portions that together form a hollow interior, sealed end portions of said envelope, and a central portion of said envelope that spaces apart said elliptical portions; an electrically conductive filament disposed in the interior of said envelope, said filament including coiled-coil portions disposed in said elliptical portions in a coiled-coil shape, a single coil interval portion disposed between said coiled-coil portions at said central portion of said envelope and single coil interval portions located near said end portions; at least one filament support for positioning said filament near a center of said envelope, the at least one said filament support comprising side filament supports located near each of said end portions and a central filament support located at said central portion; and gas contained in the interior of said envelope.