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:
Jun. 14, 1977
Filed:
Dec. 18, 1975
Applicant:
Inventors:
Robert Philbrick Alley, Danville, IL (US);
Keith Karl Klett, Danville, IL (US);
Assignee:
General Electric Company, Carmel, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315219 ; 307 66 ; 315 86 ; 3152 / ; 315D / ; 331183 ;
Abstract
An emergency lighting system includes a two-level switching transistor inverter circuit for starting and operating a fluorescent lamp from a battery upon failure of line voltage. One of the switching transistors of the two transistor inverter is arranged for connection first to a tap, then to one of the feed-in terminals of an output transformer coupled with the lamp. A timing controller effects this switching thereby automatically to provide, first, a high power level for starting the lamp, and then, a second lower power level for operating the lamp after starting.