Welch Allyn, Inc.

Raymond Alan Dean

William H Lagerway

Dean A Bell

Teresa Motz West

A miniature two-pin, tungsten-halogen lamp in the shape of a cylindrical envelope formed of high temperature glass having a sealed chamber capable of withstanding internal pressures of between 5 and 20 atmospheres. The diameter of the cylindrical envelope is in the range of 0.250 to 0.313 inches and contains at least one refractory metal filament mounted within the sealed chamber. The metal filament is electrically connected to a pair of leads passing out of the envelope. A fill gas is contained within the sealed chamber and contains an inert gas major constituent and a halide gas minor constituent. The lamp produces an efficacy of up to 26 lumens per watt when operating within a range of from 1.25 to 18 watts.

Miniature two-pin tungsten halogen lamp

A lamp which provides substantially uniform illumination over a predetermined area which includes a glass envelope having a lensed end and a curved filament contained within the envelope. The filament contains a plurality of coils which are disposed in a concave orientation with respect to the lensed end.

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Auburn, NY, United States of America

Raymond Alan Dean