General Electric Company

Thomas H Yu

Gino Savarino

Joseph Michael Ranish

George E Sakoske

Rolf S Bergman

Ronald James Olwert

Douglas G Seredich

Bernard W Rachel

Milan R Vukcevich

Bart P Terburg

Richard H Holcomb

Istvan Meszaros

Gyorgy Nagy

Richard G Lynce

John J Stewart

Thomas R Norris

Wayne A Lasch

Tamas Gal

Shailesh R Sheth

A tungsten halogen lamp () includes a light transmissive envelope (), which encloses a tungsten filament () and a gaseous fill comprising an inert gas and a halogen-containing gas, such as an alkyl halide. In addition the fill includes a silicon-containing compound capable of gettering oxygen within the envelope. The atomic ratio of silicon to halogen in the envelope is selected so as to remove most, but not all of the oxygen present in the envelope A silicon:halogen ratio of less than about 0.5 more preferably, below about 0.4 has been found to be effective in this respect.

Tungsten halogen lamp with halogen-containing compound and silicon-containing compound

Tungsten-halogen lamps capable of satisfactory operation at relatively high temperatures exceeding 250&deg; C. which comprise a high temperature glass or quartz envelope enclosing a tungsten filament and molybdenum, contain a fill comprising a mixture of noble gas, hydrogen, phosphorus, chlorine, and bromine. In a preferred embodiment the chlorine and bromine will be supplied by a single carbon atom hydrocarbon compound containing both halogens such as CHCl Br and CH BrCl.

Fill for high temperature tungsten-halogen lamps

An inlead for an electric lamp formed of an alloy of tungsten and molybdenum. The inlead has a rate of thermal expansion or contraction approximating that of the glass forming the bulb. This minimizes the expansion/contraction mis-match stress between the two materials. In addition, the alloy composition functions to reduce oxidation and degradation of the lead.

Electric lamps containing electrical leads of a molybdenum and tungsten

A lamp is provided with a mounting arrangement for achieving a precise alignment. The lamp includes a double-ended light source, a metal strap clamping one end of the light source at two locations, and a plastic base having an internal opening wherein the metal strap is engaged. The metal strap includes two clamping members between which the light source is clamped and a cap member attached to the clamping members. The cap member has tabs adapted for engaging the internal opening of the plastic base and gimbaling the light source to align the light source with respect to the plastic base. The clamping members are joined together at a point between the to clamping locations such that a spring force clamps the light source. The clamping members are also oriented at an angle of about 45 degrees from vertical to better withstand both vertical and horizontal loads.

Metal strap for holding cylindrical lamp

Tungsten-halogen lamps operating at temperatures above 250.degree. C. which contain a mixture of phosphine, hydrogen, bromine and inert gas have been found to have superior life and lumen maintenance when the atomic ratio of phosphorus to bromine in the lamp is in the range of from 0.4-2.5.

Tungsten halogen lamp including phosphorous and bromine

Growing community of inventors

Richmond Heights, OH, United States of America

Thomas H Yu