Granted Patent
Utility
US 4,338,546 · App. 06/210,235
Liquid level detection circuit for control of liquid level responsive device
Inventors:
Gordon F. Ehret, William N. Rowley, Richard E Mullen
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Nov 25, 1980
Inventors
Gordon F. Ehret
William N. Rowley
Richard E Mullen
Assignee (at issue)
The Marley-Wylain 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.