Granted Patent
Utility
US 4,591,839 · App. 06/678,589
System for detecting low liquid level and probe therefor
Inventors:
Ben J. Charboneau, Richard D. Zerod
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Dec 5, 1984
Inventors
Ben J. Charboneau
Richard D. Zerod
Assignee (at issue)
Gulf Eastern Manufacturing 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.