Granted Patent
Utility
US 5,319,974 · App. 08/114,386
Ultrasonic level measuring system
Inventors:
Steven D. Lenz, Raymond Hulinsky
Patented Case
View Patent ↗
Granted: Jun 14, 1994
Filed: Aug 30, 1993
Inventors
Steven D. Lenz
Raymond Hulinsky
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.