The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
Apr. 25, 1990
Cleve R Hildebrand, Torrance, CA (US);
Other;
Abstract
A solid state power supply and light emission controller for a luminescent lamp which converts alternating current line voltage, or direct current voltage, into a constant repetition rate, variable width pulse alternating current voltage for energizing the lamp and for controlling the light emission of the lamp. The power supply provides essentially constant contrast (light brightness ratio) in the light emission from the lamp in the presence of variations in ambient light level. The system achieves its desired result by sensing the ambient light level and also by sensing the level of the light emitted by the lamp. The luminescent lamp may, for example, be a neon lamp, a white light fluorescent lamp, an incandescent lamp, or the like.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile