Lamp intensity control system having over-current protection
Patent 5001398 Issued on March 19, 1991. Estimated Expiration Date: 
July 3, 2009. 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.
July 3, 2009. 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 References 1981985 3244934 3277442 3284770 3603840 Thermal protection of amplifiers Fluorescent light dimming Patent #: 4904906 InventorAssigneeApplicationNo. 374720 filed on 07/03/1989US Classes:315/77, Vehicle307/10.8, Lighting circuits315/80, Load device controller combined with vehicle controller315/291, CURRENT AND/OR VOLTAGE REGULATION315/293, Pre-selectable regulator systems315/309, Thermal responsive regulator330/298, Including protection means340/468, External signal light system340/469With two or more intensity levels (e.g., day or night)ExaminersPrimary: LaRoche, Eugene R.Assistant: Dinh, Son T. Attorney, Agent or FirmInternational ClassH60Q 001/26AbstractA lamp intensity control system combines the functions of the tail light, the brake light, and the turn indicator light signals into one signal for controlling a plurality of lamps in an automobile. The tail light, brake light and turn indicator light signals are combined into one signal and modulated wherein the percent of modulation determines the intensity of the brightness of the plurality of lamps. Temperature protection is provided wherein a temperature limit circuit monitors the temperature of a SENSFET and disables the SENSFET if its temperature exceeds a predetermined magnitude. Over-current and open lamp conditions are monitored by comparator circuits. An over-current condition causes the SENSFET to be disabled. An over-temperature, over-current or open-lamp condition is signaled by a fault output signal.Field of SearchVehicleHead light systems WITH AUTOMATIC SHUNT AND/OR CUTOUT Plural load device systems CURRENT AND/OR VOLTAGE REGULATION Plural load device regulation Keyboard operated or pattern controlled regulator Pre-selectable regulator systems PLURAL LOAD DEVICE SYSTEMS Thermal responsive regulator Turn signal External signal light system With two or more intensity levels (e.g., day or night) Including temperature compensation means Including protection means | |
