Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7333027 | Power supply for LED signal A power supply for a Light Emitting Diode (LED) traffic signal that controls the light intensity. The light intensity conforms to a predetermined pattern based on the input voltage root mean square value (Vrms). The input voltage is changed by acting on t... | 02/19/2008 |
| 7327281 | Traffic signal with integrated sensors A traffic signal with integrated sensors. The present invention provides an apparatus for integrating sensors with a traffic signal. A signal case has a housing and a light source placed within the housing. A door attached to the housing is configured such that phot... | 02/05/2008 |
| 7254504 | Method for the temporal synchronisation of a plurality of vehicle sensors The invention proposes a synchronization method and apparatus, wherein based on a measuring time (110, 210) and the value of at least one quantity of the at least one sensor object, the at least one sensor object is determined at at least one of the base time... | 08/07/2007 |
| 7148632 | LED lighting system A lighting device that can generate light of variable color and intensity under processor control. Multiple lighting devices of a modular design can be incorporated into a lighting system to illuminate larger areas. A lighting module includes three groups of LEDs ea... | 12/12/2006 |
| 7129856 | Illuminated sign for traffic control and method for functional monitoring of such a sign An illuminated sign is for traffic control, in particular for road traffic, and includes light sources for generation of the sign and a monitoring device for functional monitoring of the light source. The light sources are embodied as light diodes and the monitoring... | 10/31/2006 |
| 7102538 | LED signal light The present invention provides an LED signal light device comprising a central processing unit, a control panel, an LED signal light, an output and input interface, a battery and an adapter. The central processing unit comprises a microprocessor, a memory and an int... | 09/05/2006 |
| 7040773 | Self contained and powered traffic signal using natural and artificial light An traffic light capable of utilizing both natural sunlight and artificial light for illuminating selective traffic signals. Natural light is directed to a natural light router or switch and to a color switch for providing a red, amber or yellow, and a green light f... | 05/09/2006 |
| 7027957 | Current interrupter assembly A method for determining the influence of one of a plurality of cathodic protection circuits along a pipeline includes switching one of a plurality of cathodic protection circuits off, while the remainder of the plurality of cathodic protection circuits are left on,... | 04/11/2006 |
| 7009580 | Solid state lighting array driving circuit A solid-state lighting array driving circuit in which a plurality of solid-state lighting devices such as LEDs are rearranged in a reconfigurable circuit. The circuit may be changed to incorporate the LEDs into a larger or fewer number of parallel circuits each cont... | 03/07/2006 |
| 6956494 | Signal lamps and apparatus An LED signal lamp comprises at least two separate LED arrays which have separate power feeds and wherein the LEDs of the arrays are positioned with respect to each other such that when lit they provide a composite light signal output and such that when the LEDs of ... | 10/18/2005 |
| 6950079 | Light emitting diode driving circuit A luminance control circuit has luminance change characteristics similar to those of a conventional lamp when a light emitting diode is used as a light source. The luminance control circuit adjusts the value of a forward current flowing in the light emitting diode i... | 09/27/2005 |
| 6608485 | Method and device for remote monitoring of led lamps LED lamp circuitry that emulates an incandescent lamp's behavior upon remote verification of the LED lamp. The invention presents a fuse blow-out circuit and a cold filament detection circuit permitting the use of LED lamps in applications, such as railwa... | 08/19/2003 |
| 6392563 | Traffic light backup system using light-emitting diodes A traffic light backup system for use with a traffic light is described. The traffic light backup system includes an auxiliary light associated with at least one of the enclosure housing the traffic lights and rechargeable batteries associated with the au... | 05/21/2002 |
| 6268801 | Method and apparatus for retro-fitting a traffic signal light with a light emitting diode lamp module A method and apparatus for retro-fitting a traffic signal lamp with an LED lamp module. The traffic signal lamp has a housing, a front door plate attached to the housing, a lens attached to the front door plate, a reflector in the housing, a threaded elec... | 07/31/2001 |
| 5898389 | Blackout backup for traffic light A system and method for automatically supplying a flashing line voltage from power stored in an auxiliary battery to power red traffic signal lamps using clusters of light emitting diodes during a blackout condition. A plurality of flash block connectors ... | 04/27/1999 |
| 5663719 | LED traffic signal light with automatic low-line voltage compensating circuit The present invention relates to an LED traffic signal light containing numerous LEDs and a voltage compensation circuit which allows the traffic light to operate over a wide range of input power voltages, while generating sufficient light intensity to co... | 09/02/1997 |
| 5659305 | Backup traffic signal management system and method An backup vehicular traffic control system employs a connector-switch including a normally-closed electrical switch connected in series between a traffic signal and a primary control system. In the event of an emergency condition, such as a failure of the... | 08/19/1997 |
| 5612596 | Conservation traffic control load switch A solid state load switching conservation circuit removably connectable with a control output of a traffic control logic circuit and responsive to an actuating input to energize an incandescent lamp from an a.c. power source exhibiting a given voltage lev... | 03/18/1997 |
| 5457450 | LED traffic signal light with automatic low-line voltage compensating circuit The present invention relates to an LED traffic signal light containing numerous LEDs and a voltage compensation circuit which allows the traffic light to operate over a wide range of input power voltages, while generating sufficient light intensity to co... | 10/10/1995 |
| 5327123 | Traffic control system failure monitoring A traffic control system for use at a roadway intersection, the system including traffic control lights, a light flasher structure, and a plurality of load switches electrically coupled with the lights via relay structure to which the flasher structure is... | 07/05/1994 |
| 4857921 | Digital traffic control system A digital control system for controlling the flow of traffic in selected directions in response to digital signals transmitted from a common transmitting control unit to multiple separate receiving traffic control units respectively associated with each c... | 08/15/1989 |
| 4835534 | Monitoring a conflict detector for traffic-lights A monitoring system for energization of traffic lamps (L 1 . . . L 8), with energy supplied from a common voltage source. Protection is provided so that energization of any one of the lamps is not in conflict with energization of another lamp. The system ... | 05/30/1989 |
| 4481515 | Coordinator for traffic signal controller A coordinator for a traffic signal controller having a motor and associated switching system for establishing the duty and width cycle of the controller. The controller being connected, via electrical circuitry, to an AC power grid. The coordinator is a s... | 11/06/1984 |
| 4472714 | Clock synchronization circuit for control of traffic signals A device used in the control of automobile traffic signal systems for maintaining a local time reference during periods when the a.c. power is interrupted. An accurate oscillator such as a crystal controlled oscillator is used to provide a local time refe... | 09/18/1984 |
