Electricity: measuring and testing – Electric lamp or discharge device – Vacuum tube
Reexamination Certificate
2005-03-08
2005-03-08
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Electric lamp or discharge device
Vacuum tube
C324S414000, C702S034000, C315S308000
Reexamination Certificate
active
06864685
ABSTRACT:
The rare gas discharge lamp is supplied with a current, which is lower than the rated current, the voltage of the rare gas discharge lamp is determined at this instant and the swing width of this voltage is measured. A comparator for comparing measured values of the swing width of the voltage of the rare gas discharge lamp when the current control supplies a reduced current, which is lower than the rated current. A service life converter for converting the difference value output by the comparison means into an indication of the service life of the rare gas discharge lamp.
REFERENCES:
patent: 4831564 (1989-05-01), Suga
patent: 20010010447 (2001-08-01), Yamane et al.
patent: 11-121339 (1999-04-01), None
patent: 2001-85176 (2001-03-01), None
Matsushima Takeo
Otsuka Masaharu
Nguyen Vincent Q.
Nixon & Peabody LLP
Safran David S.
Ushiodenki Kabushiki Kaisha
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