Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Reexamination Certificate
1999-06-24
2001-01-09
Gorgos, Kathryn (Department: 1741)
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C204S157500, C422S186070, C422S186030
Reexamination Certificate
active
06171452
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates to systems for generating ozone, and in particular to controlled use of ultraviolet radiation for generating ozone.
Ultraviolet radiation has long been known to be an effective generator of ozone. Prior art ozone generation systems rely solely on the use of electroded linear low pressure discharge lamps that use mercury. These linear systems are very similar to standard fluorescent lamps in terms of operation, except that there are no phosphor coatings and the glass used (a hard glass, not quartz) usually transmits a substantial amount of the 254 nm radiation emitted from the mercury atom. These electroded systems have two typical modes of failure: 1) electrode failure and 2) solarization of the glass due to the UV flux.
It would be a desirable advance upon the prior art to have a UV ozone generation device having a longer-lived lamp and ballast. It is furthermore desirable that such a device be made out of high quality quartz which does not degrade as rapidly as treated hard glass. It is also desirable to provide such a device with a compact design which operates at higher power and provides higher UV output.
BRIEF SUMMARY OF THE INVENTION
A low-pressure electrodeless lamp having high ultraviolet transmission properties is used for controlled generation of ozone. The lamp envelope is preferably comprised of a glass/quartz composite. The ultraviolet output (primarily 254 nm radiation) is directed from the low pressure (e.g., mercury) discharge into a cylindrical enclosure around the lamp, through which air is channeled. The cylindrical enclosure is constructed with a fan at one end that forces air from outside the enclosure over the lamp body such that air mixed with ozone flows out the other end of the cylinder.
REFERENCES:
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patent: 4535247 (1985-08-01), Kurtz
patent: 4694179 (1987-09-01), Lew et al.
patent: 5326539 (1994-07-01), Taylor
patent: 5382878 (1995-01-01), Secen et al.
patent: 5760547 (1998-06-01), Borowiec
patent: 5959405 (1999-09-01), Soules et al.
Breedlove Jill M.
General Electric Company
Gorgos Kathryn
Stoner Douglas E.
Tran Thao
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