Granted Patent
Utility
US 5,901,603 · App. 09/116,266
Liquid level monitor
Inventor:
Robert R. Fiedler
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Jul 16, 1998
Inventor
Robert R. Fiedler
Assignee (at issue)
Isco, Inc.
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.