Granted Patent
Utility
US 5,398,104 · App. 08/250,732
Passive toner concentration control system
Inventor:
David J. Arcaro
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: May 27, 1994
Inventor
David J. Arcaro
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.