Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Reexamination Certificate
2007-06-05
2007-06-05
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
C313S634000, C445S026000, C445S043000
Reexamination Certificate
active
10751156
ABSTRACT:
A method for forming a cold spot region on a discharge tube of a discharge lamp is disclosed. In the method, a discharge tube is formed, and a tubular extension is formed on at least one end of the discharge tube. The tubular extension has a smaller diameter than the diameter of the discharge tube end. The tubular extension is formed so that a free end of the tubular extension extends away from the end of the discharge tube. A reduced thickness portion is formed on the tubular extension. The reduced thickness portion is formed as a membrane.A discharge lamp is also disclosed, which comprises a discharge tube with a tubular extension located at an end of the discharge tube. The tubular extension has a smaller diameter than the diameter of the discharge tube end, and the tubular extension comprises a reduced thickness portion. The reduced thickness portion is a membrane, preferably formed of the material of the tubular extension.
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patent: 3957328 (1976-05-01), VAN DER Wolf et al.
patent: 4329166 (1982-05-01), Murphy
patent: 4549251 (1985-10-01), Chapman et al.
patent: 6337539 (2002-01-01), Yorifuji et al.
patent: 57053058 (1982-03-01), None
Bajnok János
Horváth András
Lukács Sándor
Fay Sharpe LLP
General Electric Company
Patel Nimeshkumar D.
Perry Anthony
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