Granted Patent
Utility
US 4,744,808 · App. 06/925,736
Liquid level sensing and control
Inventor:
Dennis M. Treu
Patented Case
View Patent ↗
Granted: May 17, 1988
Filed: Oct 30, 1986
Inventor
Dennis M. Treu
Assignee (at issue)
Cobe Laboratories, 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.