Granted Patent
Utility
US 4,839,092 · App. 07/034,332
Photoluminescent materials for outputting orange light
Inventor:
Joseph Lindmayer
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Apr 3, 1987
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.