Granted Patent
Utility
US 4,654,646 · App. 06/704,347
Modular liquid level sensor having integral electronics
Inventor:
Ben J. Charboneau
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Feb 22, 1985
Inventor
Ben J. Charboneau
Assignee (at issue)
Wickes Manufacturing Co.
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.