Granted Patent
Utility
US 5,954,423 · App. 08/850,493
Light distribution diffuser for exit signs and the like illuminated by LED arrays
Inventors:
Mark Campbell Logan, James Michael Lay
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: May 2, 1997
Inventors
Mark Campbell Logan
James Michael Lay
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.