Granted Patent
Utility
US 4,693,906 · App. 06/813,928
Dielectric for electroluminescent devices, and methods for making
Inventor:
Joseph Lindmayer
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: Dec 27, 1985
Inventor
Joseph Lindmayer
Assignee (at issue)
QUANEX 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.