Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Reexamination Certificate
2005-07-07
2008-11-18
Williams, Joseph L (Department: 2889)
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
C313S634000, C313S565000, C313S493000, C220S00210R
Reexamination Certificate
active
07453196
ABSTRACT:
A fluorescent lamp uses new cold-end technology or an enveloped fluorescent lamp with high surface load. The lamp features a lamp tube, cathode, stem cap and wire, such that one end of the wire connected to the cathode is fixed on the stem cap and the other end of the wire is led out from the lamp tube. At least one cavity tube connecting through the lamp tube is disposed on the side of at least one lamp tube. Advantages of the fluorescent lamp include: (1) the temperature of cavity tube is not influenced directly with electrical arc since there is no discharge through appended cavity tube, thus mercury-vapor pressure adjustment with cold-end is made possible; furthermore, mercury-vapor pressure is decreased significantly on energy saving lamps with high power or lamps in high environmental temperature; (2) by adjusting the length and/or position of the cavity tube, mercury-vapor pressure in the lamp tube can be adjusted efficiently; (3) if amalgam is required for the lamp tube, the adjustment work becomes easy and efficient by positioning the amalgam at the coldest point; with adding auxiliary cathode selectively, good luminous flux is formed rapidly when the lamp is turned on initially; (4) the effective service life of the lamp tube is lengthened since the harmful materials to luminous flux output produced during lamp operation are collected at the cold-end of cavity tube.
REFERENCES:
patent: 4665341 (1987-05-01), Imamura et al.
patent: 5739633 (1998-04-01), Biro et al.
patent: 6268694 (2001-07-01), Fujimoto
patent: 6437504 (2002-08-01), Foo
patent: 7045946 (2006-05-01), Kawase et al.
patent: 7173254 (2007-02-01), Sauska et al.
Alix Yale & Ristas, LLP
Mass Technology (H.K.) Limited
Williams Joseph L
LandOfFree
Fluorescent lamp with cavity tube does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluorescent lamp with cavity tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluorescent lamp with cavity tube will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4051255