Granted Patent
Utility
US 5,040,021 · App. 07/516,655
Transmission densitometer by using differential comparison of electrostatic voltage signals
Inventor:
William Y. Fowlkes
Patented Case
View Patent ↗
Granted: Aug 13, 1991
Filed: Apr 30, 1990
Inventor
William Y. Fowlkes
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.