Granted Patent
Utility
US 4,377,809 · App. 06/257,741
Liquid level system
Inventor:
Victor N. Lawford
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Apr 27, 1981
Inventor
Victor N. Lawford
Assignee (at issue)
ITT Corporation
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.