Granted Patent
Utility
US 5,216,288 · App. 07/792,942
Water level control circuit for sump pumps and the like
Inventor:
James L. Greene
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Nov 15, 1991
Inventor
James L. Greene
Assignee (at issue)
The Marley Company LLC
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.