Did You Know...
...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8106591 | Lamp failure detector An apparatus and method for detecting lamp failure is described for an array of lamps used in a rapid thermal processing system. The lamp failure detection system enables identification of a failed lamp among a plurality of lamps, and also provides identification of... | 01/31/2012 |
| 8076856 | LED lamp An LED lamp includes an optical part, a heat dissipation part and an electric part. The optical part includes main and auxiliary LED light sources thermally attached to the heat dissipation part. The electric part includes a rechargeable battery and a circuitry for ... | 12/13/2011 |
| 7282863 | Auxiliary quartz lamp lighting system for electronic high intensity discharge lamp ballasts A method and electronic circuit operate a quartz auxiliary lamp lighting lamp and circuit to light a quartz auxiliary lamp at 120 Vac and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 100 Hz to over 400 kHz and voltages of from ... | 10/16/2007 |
| 7167829 | Curing lamp apparatus giving operating conditions with electronic voice A curing lamp apparatus is used for providing electronic voice information to report a number of operating conditions associated with the curing lamp. The apparatus includes a light sensor for sensing output power, voltage and current sensors for sensing input power... | 01/23/2007 |
| 7164359 | Networked RF tag for tracking freight The invention disclosed provides a method, system, and associated tag for detection and tracking of inanimate and animate objects. The novel method broadly comprises the steps of: a) attaching a low radio frequency detection tag to each of the objects, each tag comp... | 01/16/2007 |
| 7023353 | Warning device status circuit including a status output device A warning device including a status and function indicator circuit for indicating the status and function of the warning device. In a visual warning device such as a strobe light, the status and function indicator circuit includes a status output device such as an L... | 04/04/2006 |
| 7015652 | Electronic ballast having end of lamp life, overheating, and shut down protections, and reignition and multiple striking capabilities An electronic ballast having end of lamp life and overheating protection, and automatic reignition and multiple striking capabilities includes AC/DC rectifier, PFC/boost, inverter, and ballast protection and control circuits. The ballast protection and control circu... | 03/21/2006 |
| 6958583 | AC voltage control circuit The inventive control circuit 40 serves to render the output voltage to be the output value of any one of the outputs OUT1 to OUT5 when both the main power source A of the power saving device 100 and the control circuit's switch B are in ... | 10/25/2005 |
| 6788000 | Distributed emergency lighting system having self-testing and diagnostic capabilities A distributed emergency building lighting system senses the presence or absence of AC power at the input of a switch controlling lighting in a designated area or an input stimulus such as an alarm to provide low-level marking for visual delineation of the path of eg... | 09/07/2004 |
| 6653790 | Automatic gas lamp with safety control circuit A gas lamp system and method for lighting the system which utilizes a sparkless flame starter in close proximity to the torch to create a flame. The system further includes a safety control circuit which activates the sparkless flame starter and subsequen... | 11/25/2003 |
| 6549246 | Method for driving projection cathode ray tube In a projection CRT, an image of high brightness is displayed on a screen as an electron beam emitted from an electron gun is scanned according to an image driving signal. The image is magnified and projected through a lens unit. Here, voltage of a direct... | 04/15/2003 |
| 6476559 | Ceremonial luminary and associated process A ceremonial illuminary including a voltage supply mechanism, a switching mechanism that is electrically connected to the voltage supply mechanism, a first lamp electrically connected to the switching mechanism, a second lamp electrically connected to the... | 11/05/2002 |
| 6118371 | Adaptive vehicle lighting control system A novel vehicle lighting control circuit for reducing the light intensity of a vehicle lighting element via pulse width modulation. A pulse width modulation adjuster is provided for producing a pulse width modulation control signal in order to operate the... | 09/12/2000 |
| 5666029 | Fluorescent emergency ballast self test circuit A lighting system composed of: an AC ballast for delivering AC power from an AC power source to a lamp; an emergency power supply for delivering AC power to the lamp when the AC power source fails; and a switch for disconnecting the AC ballast from the AC... | 09/09/1997 |
| 5646484 | High reliability incandescent portable illumination system A high reliability portable incandescent illumination system for use in applications which require a reliable, high output light source such as heliport markers, runway lights, warning lights, road hazard and obstruction lights. The required elements of t... | 07/08/1997 |
| 5493180 | Lamp protective, electronic ballast A lamp protective, electronic ballast includes a lamp voltage detector having a capacitor and resistor series connected across a discharge lamp. The junction of the resistor and capacitor is coupled to a voltage sensitive switch for detecting DC offset on... | 02/20/1996 |
| 5453666 | High intensity discharge lamp ballast having a transient protected power factor correction scheme A ballast for lighting a high intensity discharge lamp having a power factor correction scheme. The power factor correction scheme includes a triac. To prevent the triac from damage when the lamp is not lit and power line transients are present, the triac... | 09/26/1995 |
| 5430354 | HID lamp and auxiliary lamp ballast using a single multiple function switch A ballast for lighting an auxiliary source of illumination whenever a primary source of illumination fails to ignite. The auxiliary source of illumination is effectively turned OFF by placing a short circuit thereacross whenever the primary source of illu... | 07/04/1995 |
| 5418435 | Light controller with overload current protection circuit The invention provides a light controller for lamps which can reduce the number of parts, cost and size. A rectangular wave voltage output from an astable multivibrator (1) is inverted by an inverter (3) and then supplied to a gate of a P-channel MOS FET ... | 05/23/1995 |
| 5256946 | Gaseous discharge lamp system with auxiliary lamp A lighting system having a primary light source and an emergency lamp. The emergency lamp is turned on and remains on upon failure or removal from the system of the primary light source. The system also includes a control device for sensing when the volta... | 10/26/1993 |
| 4961028 | Lighting equipment Equipment for lighting a work area has a plurality of light sources, at least one of which is usually lighted; the others are spare light sources and are usually turned off. The equipment has means such as an optical fiber to conduct light from the light ... | 10/02/1990 |
| 4897573 | Electric incandescent lamp having discharge arc conductor and discharge arc interruption fuse The electric incandescent lamp has a filament connected to current supply conductors and kept taut by a frame of longitudinal arc discharge conductors and transverse insulators. The arc discharge conductors are each connected to a point on the current sup... | 01/30/1990 |
| 4785390 | Instantaneous failure compensation circuit A compensation circuit includes a circuit for monitoring the current delivered to a load and for producing a switching signal whenever a current spike is detected. A control signal representative of the desired voltage across the load is produced. A power... | 11/15/1988 |
| 4752719 | Boosted D.C. supply circuit and luminaire employing same A luminaire using a tungsten-halogen lamp, includes a circuit for supplying the lamp with a boosted D.C. operating voltage. The circuit includes a full-wave rectifying circuit for receiving a standard A.C. mains supply voltage, and a low pass filter conne... | 06/21/1988 |
| 4560906 | Lighting system and compact electric lighting unit A lighting system having a high pressure gas discharge light source and an incandescent light source within a common sealed and evacuated bulb. A ballast unit fitted externally to the neck of the bulb includes in series with the incandescent light source ... | 12/24/1985 |
| 4517498 | Sequence start lamp ballast with current spike suppression means A ballast for a sequence start series operating circuit that includes two rapid start gaseous discharge lamps. The circuit includes a transformer with a primary winding and a loosely coupled secondary winding, a series first capacitor for providing a lead... | 05/14/1985 |
| 4439801 | Electrical load imbalance detection and protection apparatus The apparatus includes three electrodes housed in a single enclosure which is filled with a gas. A first one of the electrodes is connected to the junction of a load and a fuse. A second one of the electrodes is connected to an intermediate point of the l... | 03/27/1984 |
| 4438365 | Spark gap for line transient protection An improved spark gap device and configuration for coupling the device in circuit with equipment such as television receivers are disclosed. The spark gap device includes three conductive pads, the first and second of which are separated by a first gap. T... | 03/20/1984 |
| 4278916 | Instant-on light source A light source includes a high pressure discharge lamp and incandescent filaments which provide illumination during the warm-up and hot restart periods associated with the discharge lamp. A current regulator, which provides dc power to the discharge lamp,... | 07/14/1981 |
| 4232252 | Lighting network including a gas discharge lamp and standby lamp A lighting network is described which includes a main gas discharge lamp, a standby lamp and a control circuit. The control circuit senses when the gas discharge lamp is operating normally and turns off the standby lamp. When the discharge lamp is not up ... | 11/04/1980 |
| 4104560 | Lighting system for a motor vehicle A voltage detecting means, such as a voltage winding, a zener diode or the like, is connected across a power source and is operative when the voltage applied thereto exceeds a predetermined value owing to a disconnection of a main lamp also connected acro... | 08/01/1978 |
| 4047076 | Emergency lighting system for gaseous discharge lamps This invention pertains to an emergency lighting circuit that operates with a high pressure, gaseous-discharge lamp and associated ballast. When the gaseous-discharge lamp goes out, after once being ignited, sufficient current is supplied to an incandesce... | 09/06/1977 |
