Granted Patent
Utility
US 5,202,092 · App. 07/801,889
Device for monitoring the PH of water based inks
Inventor:
Robert A. Norcross, Jr.
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Dec 3, 1991
Inventor
Robert A. Norcross, Jr.
Assignee (at issue)
Norcross Group (Holdings) Ltd.
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.