1
Bradford J Perry: Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal. Precision Solar Controls, Nixon & Vanderhye P C, November 21, 2000: US06150771 (168 worldwide citation)

A circuit for interfacing between a conventional traffic signal's control monitor and a plurality of light emitting diodes (LEDs) replacing an incandescent lamp of the traffic signal is disclosed. The interface circuit includes a current source for driving the LEDs with a regulated power factor corr ...


2
Kevin G Alston: LED lamp including refractive lens element. Precision Solar Controls, Mason Fenwick & Lawrence, December 29, 1992: US05174649 (92 worldwide citation)

A lamp includes one or more LED's which illuminate respective portions of a refractive lens element whose incident surface preferably includes portions of hyperboloids which translate the LEDs' emitted rays into substantially parallel beams within the lens element. The lens element's exit surface is ...


3
Alston Kevin Grant: Led lamp including refractive lens element.. Precision Solar Controls, January 20, 1993: EP0523927-A2 (24 worldwide citation)

A lamp includes one or more LED's which illuminate respective portions of a refractive lens element whose incident surface preferably includes portions of hyperboloids which translate the LEDs' emitted rays into substantially parallel beams within the lens element. The lens element's exit surface is ...


4
David L Smith, Steven M Canan: De-icing system for traffic signals. Precision Solar Controls, Nixon & Vanderhye P C, May 1, 2007: US07211771 (16 worldwide citation)

A circuit is disclosed for detecting and eliminating the buildup of snow and/or ice on the viewable face of an LED traffic signal lens. The circuit measures the ambient temperature within the LED signal, and when the temperature falls to a level where snow and/or ice accumulation can occur, the circ ...


5
Alston Kevin Grant: Lampe led comprenant un element de lentille refractive, Led lamp including refractive lens element. Precision Solar Controls, RIDOUT & MAYBEE, CA2073751

A lamp includes one or more LED's which illuminate respective portions of a refractive lens element whose incident surface preferably includes portions of hyperboloids which translate the LEDs' emitted rays into substantially parallel beams within the lens element. The lens element's exit surface is ...


6
Smith David L, Canan Steven M: Systeme de degivrage pour feux de circulation, De-icing system for traffic signals. Precision Solar Controls, Precision Solar Controls, Bereskin & Parr Sencrl, November 2, 2010: CA2548886

A circuit is disclosed for detecting and eliminating the buildup of snow and/or ice on the viewable face of an LED traffic signal lens. The circuit measures the ambient temperature within the LED signal, and when the temperature falls to a level where snow and/or ice accumulation can occur, the circ ...


7
David L Smith, Steven M Canan: De-icing system for traffic signals. Precision Solar Controls, Nixon & Vanderhye PC, May 24, 2007: US20070114225-A1

A circuit is disclosed for detecting and eliminating the buildup of snow and/or ice on the viewable face of an LED traffic signal lens. The circuit measures the ambient temperature within the LED signal, and when the temperature falls to a level where snow and/or ice accumulation can occur, the circ ...