Granted Patent
Utility
US 5,646,502 · App. 08/519,804
Emergency lighting circuit for shunt-regulated battery charging and lamp operation
Inventor:
James C. Johnson
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Aug 28, 1995
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.