Granted Patent
Utility
US 4,809,044 · App. 06/936,553
Thin film overvoltage protection devices
Inventors:
Roger W. Pryor, Napoleon P. Formigoni, Stanford R. Ovshinsky
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Nov 26, 1986
Inventors
Roger W. Pryor
Napoleon P. Formigoni
Stanford R. Ovshinsky
Assignee (at issue)
Energy Conversion Devices, 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.