Granted Patent
Utility
US 5,005,516 · App. 07/444,257
Device for aiding in measuring pigmented marking particle level in a magnetic brush development apparatus
Inventor:
Larry W. Speer
Patented Case
View Patent ↗
Granted: Apr 9, 1991
Filed: Dec 1, 1989
Inventor
Larry W. Speer
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.