Mercury vapor discharge lamp containing means for reducing mercu

Details Mercury vapor discharge lamp containing means for reducing mercu Mercury vapor discharge lamp containing means for reducing mercu

1991-10-09

1993-07-20

Yusko, Donald J.

Electric lamp and discharge devices

Having vapor generating material

Mercury vapor material

313318, 313485, 313490, 445 2, 445 61, 445 73, H01J 6100

Patent

active

052296865

ABSTRACT:
A mercury vapor discharge lamp (e.g., a fluorescent lamp) having an envelope containing an inert starting gas and a quantity of elemental mercury at least partially convertible to soluble mercury. Enclosed within the lamp is an amount of chemical agent suitable for chemically combining a substantial portion of the soluble mercury as a sparingly soluble salt when the lamp is pulverized as a result of disposal. In one embodiment, the chemical agent is potassium periodate which is sealed within a enclosure which is rupturable upon pulverization of the lamp. The sealed enclosure may be disposed within the envelope or external to the envelope, such as within a cavity defined by a lamp base. In another embodiment, the chemical agent is mixed with the basing cement used to secure one or more of the the lamp bases to the envelope.

REFERENCES:
patent: 3392298 (1968-07-01), Menelly
patent: 3781586 (1973-12-01), Johnson
patent: 4268306 (1981-05-01), Bjorkman
patent: 4319157 (1982-03-01), De Vrijer
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patent: 4469980 (1984-09-01), Johnson
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Federal Register, pp. 26987-26998, vol. 55, No. 126, Jun. 29, 1990.
Experimental Electrochemistry For Chemists, pp. 303-304, 1974.
The Condensed Chemical Dictionary, p. 434, 1961.
Glossary of Chemical Terms, p. 6, 1982.

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