Illumination – Light source and modifier – Ionized gas or vapor light source
Reexamination Certificate
2005-03-15
2005-03-15
O'Shea, Sandra (Department: 2875)
Illumination
Light source and modifier
Ionized gas or vapor light source
C362S195000
Reexamination Certificate
active
06866400
ABSTRACT:
A hand-held flashlight comprising a metal halide arc lamp operating between 8 and 22 watts. The lamp has an arc gap of between 0.7 and 1.4 mm and a color temperature at or above 5000° Kelvin. The lamp contains a fill gas including mercury and indium in percentages to produce a point source of white light capable of penetrating dense smoke and fog. The flashlight includes a reflector containing the arc lamp and providing a collimated beam of high intensity white light. The flashlight includes a circuit for providing a high starting voltage to the lamp and a lower operating voltage after sustaining the lamp. The circuit includes a battery, a ballast, and a microprocessor for monitoring the lamp and the battery. The microprocessor provides a discernible output signal indicative of the lamp on-time and battery voltage. The microprocessor controls the application of the starting voltage from the ballast to the lamp to prevent misstarting of the lamp.
REFERENCES:
patent: 4914356 (1990-04-01), Cockram et al.
patent: 5034663 (1991-07-01), Cook et al.
patent: 5144201 (1992-09-01), Graham et al.
patent: 5604406 (1997-02-01), Gaus
patent: 5630661 (1997-05-01), Fox
Ernyey Lorand
Harkins John
Wood Robert J.
Alavi Ali
O'Shea Sandra
Wall Marjama & Bilinski LLP
Welch Allyn Inc.
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