Granted Patent
Utility
US 5,739,639 · App. 08/675,109
Method and apparatus for operating LED array and charging battery for emergency LED operation including DC boost circuit allowing series connection of LED array and battery
Inventor:
James C. Johnson
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: Jul 3, 1996
Inventor
James C. Johnson
Assignee (at issue)
NSI Enterprises, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.