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Class Information
Number: 315/91
Name: Electric lamp and discharge devices: systems > Automatic substitution of the load device or electrode > Over-voltage or over-current controlled substitution
Description: Systems provided with means for automatically substituting the nonoperating load device or electrode for the first to operate load device or electrode in response to excessive voltage or current conditions as would tend to damage the first to operate load device or electrode.

Patents under this class:

Patent Number Title Of Patent Date Issued
8624508 LED device with voltage-limiting unit and voltage-equalizing resistance Jan. 7, 2014
8610369 Electronic circuit for driving a fluorescent lamp and lighting application Dec. 17, 2013
8569954 Luminescence driving apparatus, display apparatus, and driving method thereof Oct. 29, 2013
8547019 Lamp assembly and circuits for protection against miswiring in a lamp controller Oct. 1, 2013
8502467 Controller for a light fixture Aug. 6, 2013
8324812 Protecting ballast circuitry against miswiring Dec. 4, 2012
8106591 Lamp failure detector Jan. 31, 2012
8076856 LED lamp Dec. 13, 2011
7923933 Lamp failure detector Apr. 12, 2011
7619367 Electronic ballast protection Nov. 17, 2009
6788000 Distributed emergency lighting system having self-testing and diagnostic capabilities Sep. 7, 2004
6653790 Automatic gas lamp with safety control circuit Nov. 25, 2003
6549246 Method for driving projection cathode ray tube Apr. 15, 2003
6476559 Ceremonial luminary and associated process Nov. 5, 2002
6118371 Adaptive vehicle lighting control system Sep. 12, 2000
5666029 Fluorescent emergency ballast self test circuit Sep. 9, 1997
5646484 High reliability incandescent portable illumination system Jul. 8, 1997
5493180 Lamp protective, electronic ballast Feb. 20, 1996
5453666 High intensity discharge lamp ballast having a transient protected power factor correction scheme Sep. 26, 1995
5430354 HID lamp and auxiliary lamp ballast using a single multiple function switch Jul. 4, 1995
5418435 Light controller with overload current protection circuit May. 23, 1995
5256946 Gaseous discharge lamp system with auxiliary lamp Oct. 26, 1993
4961028 Lighting equipment Oct. 2, 1990
4897573 Electric incandescent lamp having discharge arc conductor and discharge arc interruption fuse Jan. 30, 1990
4785390 Instantaneous failure compensation circuit Nov. 15, 1988
4752719 Boosted D.C. supply circuit and luminaire employing same Jun. 21, 1988
4560906 Lighting system and compact electric lighting unit Dec. 24, 1985
4517498 Sequence start lamp ballast with current spike suppression means May. 14, 1985
4439801 Electrical load imbalance detection and protection apparatus Mar. 27, 1984
4438365 Spark gap for line transient protection Mar. 20, 1984
4278916 Instant-on light source Jul. 14, 1981
4232252 Lighting network including a gas discharge lamp and standby lamp Nov. 4, 1980
4104560 Lighting system for a motor vehicle Aug. 1, 1978
4047076 Emergency lighting system for gaseous discharge lamps Sep. 6, 1977

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