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Class Information
Number: 315/65
Name: Electric lamp and discharge devices: systems > Combined load device or load device temperature modifying means and electrical circuit device structure > Multiple filament load devices > Automatic substitution of the filament
Description: Multiple filament load devices, provided with means for maintaining one of the filaments in nonoperating connection with respect to the current supply circuit while another of the filaments is maintained in operative relation with respect to the supply circuit, means being provided which operate automatically (1) in response to either the failure of the operatively connected filament to operate properly or its failure to operate at all, or (2) when excessive voltage or current conditions prevail which would tend to damage the operating filament, to connect the nonoperating filament in operative relation to the supply circuit and to disconnect the operating filament from the supply circuit whereby one filament is substituted for the other.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6583536 |
Multiple, sequential filament lamp |
Jun. 24, 2003 |
| 6278382 |
Recognition/anti-collision light for aircraft |
Aug. 21, 2001 |
| 6054812 |
Multifilament light bulb |
Apr. 25, 2000 |
| 5498929 |
Vehicle lighting enhancement system |
Mar. 12, 1996 |
| 5345143 |
Light bulb with program disc |
Sep. 6, 1994 |
| 5296783 |
Dual filament lamp and drive apparatus for dimmable avionics displays |
Mar. 22, 1994 |
| 5256947 |
Multiple filament enhanced ion source |
Oct. 26, 1993 |
| 5132594 |
Longer-life incandescent lamp |
Jul. 21, 1992 |
| 5061879 |
Dual filament lamp control system |
Oct. 29, 1991 |
| 5003224 |
Method and a device for replacing incandescent filaments, and a lamp with several filaments |
Mar. 26, 1991 |
| 4841196 |
Two-filament lamp and operating circuit and method for designing same |
Jun. 20, 1989 |
| 4742273 |
Long life incandescent lamp |
May. 3, 1988 |
| 4580079 |
Multifilament bulb with filament switching device |
Apr. 1, 1986 |
| 4527095 |
Lamp circuit apparatus |
Jul. 2, 1985 |
| 4490649 |
Thermal baffle inside a discharge lamp |
Dec. 25, 1984 |
| 4461974 |
Dual light source |
Jul. 24, 1984 |
| 4458179 |
Controller for lamp having more than one light source |
Jul. 3, 1984 |
| 4447760 |
Filament switching device |
May. 8, 1984 |
| 4410835 |
Utility emergency lamp and solid state switching and battery charging circuit therefor |
Oct. 18, 1983 |
| 4382209 |
Thermal switch and dual filament long life lamp |
May. 3, 1983 |
| 4287452 |
Multiple filament electric lamp |
Sep. 1, 1981 |
| 4179637 |
Incandescent light bulb with multiple filaments providing multiple lives |
Dec. 18, 1979 |
| 3968395 |
Two filament electric bulb traffic light |
Jul. 6, 1976 |
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