Electric lamp and discharge devices – Having vapor generating material – Mercury vapor material
Patent
1998-03-06
1999-11-30
Patel, Nimeshkumar D.
Electric lamp and discharge devices
Having vapor generating material
Mercury vapor material
313638, 313639, H01J 1726
Patent
active
059948388
ABSTRACT:
In a mercury vapor discharge lamp having an envelope of light-transmitting vitreous material and containing an inert gas and a quantity of elemental mercury at least partially convertible to soluble mercury, and first and second electrodes disposed within the envelope for establishing an arc discharge therebetween, an improvement comprising an effective amount of a nonmetallic copper-containing compound disposed in the lamp which, when the lamp is pulverized to granules and subjected to a suitable aqueous acid solution, dissolves in the aqueous acid solution, resulting in a concentration of extracted mercury less than 0.2 mg per liter of solution; and a method for reducing the amount of mercury extracted from a mercury vapor discharge lamp when the lamp is pulverized to granules and subjected to a suitable aqueous acid solution, such that the resulting concentration of extracted mercury is less than 0.2 mg per liter of solution, the method comprising the step of placing in the lamp in manufacture thereof an effective amount of a nonmetallic copper-containing compound soluble in the aqueous acid solution.
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Fowler Richard A.
Klinedinst Keith A.
Shinn Dennis B.
Bessone Carlo S.
Osram Sylvania Inc.
Patel Nimeshkumar D.
Smith Michael J.
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