Granted Patent
Utility
US 4,964,090 · App. 07/381,899
Ultrasonic fluid level sensor
Inventor:
Michael C. McCarthy
Patented Case
View Patent ↗
Granted: Oct 16, 1990
Filed: Jul 19, 1989
Inventor
Michael C. McCarthy
Assignee (at issue)
TRW 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.