Granted Patent
Utility
US 4,992,302 · App. 07/338,190
Process for making photoluminescent materials
Inventor:
Joseph Lindmayer
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Apr 14, 1989
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.