Granted Patent
Utility
US 4,506,973 · App. 06/506,094
Toner concentration monitoring apparatus located behind a transparent photoconductor
Inventor:
William Ernst
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Jun 20, 1983
Inventor
William Ernst
Assignee (at issue)
EASTMAN KODAK COMPANY
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.