Granted Patent
Utility
US 4,652,794 · App. 06/558,526
Electroluminescent device having a resistive backing layer
Inventors:
Michael Waite, John L. Williams, John Robert Siddle
Patented Case
View Patent ↗
Granted: Mar 24, 1987
Filed: Dec 6, 1983
Inventors
Michael Waite
John L. Williams
John Robert Siddle
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.