Discharge lamp

Details Discharge lamp Discharge lamp

2005-01-04

2005-01-04

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

C313S637000

Reexamination Certificate

active

06838823

ABSTRACT:
An ultra-high pressure mercury lamp in which both devitrification and also breakage of the discharge vessel can be eliminated. In the ultra-high pressure mercury lamp, there is a pair of opposed electrodes in a fused silica glass discharge vessel filled at least 0.15 mg/mm3mercury, and an alkali metal concentration in the area from the inside surface of this discharge vessel to a depth of 4 microns that is at most 10 wt. ppm.

REFERENCES:
patent: 5109181 (1992-04-01), Fischer et al.
patent: 5497049 (1996-03-01), Fischer
patent: 6504302 (2003-01-01), Nishida
patent: 6653786 (2003-11-01), Fukushima et al.

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