Granted Patent
Utility
US 4,583,085 · App. 06/692,947
Liquid level sensor assembly
Inventor:
Wilbert E. Beller
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Jan 18, 1985
Inventor
Wilbert E. Beller
Assignee (at issue)
The Singer Company Limited
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.