Granted Patent
Utility
US 6,142,648 · App. 09/132,814
Emergency lighting unit/exit sign combination
Inventors:
Mark Campbell Logan, Andrew Edward Masters, Edwin Lewis Hull
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: Aug 12, 1998
Inventors
Mark Campbell Logan
Andrew Edward Masters
Edwin Lewis Hull
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.