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| Number | Title | Issue Date |
| 4931701 | Bi-level ballast circuit for operating HID lamps A bi-level ballast network is disclosed for operating an HID lamp at either a low power or standby level and at a high power or full light level. The network includes an unswitched capacitor connected to the transformer ballast coil and a switched capacit... | 06/05/1990 |
| 4498126 | Lighting fixture with relamping socket apparatus A hinged bracket for permitting the swinging away, within limits, of at least one socket to permit easy access to an elongated, doubled-ended bulb for relamping purposes, the relamping apparatus holding the bulb firmly enough to prevent its dropping out o... | 02/05/1985 |
| 4482844 | Lamp dimmer A lamp dimmer suited for fluorescent and other lamps which controllably notches the applied voltage to a lamp circuit each half cycle. Progressively larger dimming control voltages produces progressively wider notches as well as progressively causing the ... | 11/13/1984 |
| 4471422 | Dc-to-ac Inverter A dc-to-ac inverter employing a control low power section and a power section. The low power section comprises a square wave generator, cross-coupled NOR latches and low level transistor switches for providing switching current to the power section. The p... | 09/11/1984 |
| 4467265 | Battery charger A battery charger with an SCR providing high charging current to a battery until a predetermined high voltage level is sensed. When the voltage sensed reduces to a float voltage minimum level, a trickle charge current is supplied through another SCR until... | 08/21/1984 |
| 4426603 | HPS Starting aid An HPS starting aid for providing pulses to an HPS lamp via a ballast tap connection, the aid employing a capacitive voltage divider connected to the power distribution line for charging purposes. There is no power resistor so that the pulse width and amp... | 01/17/1984 |
