Traffic signal head with multiple LED illumination sources
Patent 6567010 Issued on May 20, 2003. Estimated Expiration Date: 
March 31, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 31, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOrnamental lighting system Traffic-related message signal using light-emitting diodes Method for adjusting video signal gain Controlled lighting system LED traffic signal light with automatic low-line voltage compensating circuit LED traffic light and method of manufacture and use thereof Light emitting artwork Patent #: 6058634 InventorsApplicationNo. 541672 filed on 03/31/2000US Classes:340/815.67, Plural340/815.45, Using light emitting diodes340/815.65, Multiple colors340/907, TRAFFIC CONTROL INDICATOR362/231Different wavelengthsExaminersPrimary: Pham, Hoa Q.Foreign Patent References
International ClassG08B 005/36AbstractA traffic signal head uses a plurality of LED light sources mounted in one or more containment volumes in a housing. One version uses identical three-color LED light sources distributed through the containment volume: each source having a red light generating element, a yellow light generating element, and a green light generating element. A second version uses identical two-color LED light sources distributed through the containment volume, each source having a red LED light generating element and a green LED light generating element. For the second version, activation circuitry enables individual activation of the red LED elements to produce red signals, individual activation of the green LED elements to produce green signals, and concurrent activation of both types of LED elements to produce yellow signals. Both versions can be electrically configured to display any of the three colors, as well as special symbols-such as directional arrows.Other References
| |
