Granted Patent
Utility
US 5,235,179 · App. 07/764,754
Evanescent wave liquid level sensor with density compensation
Inventors:
David B. Chang, Victor Vali, Keith Pearson, Albert F. Lawrence
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Sep 24, 1991
Inventors
David B. Chang
Victor Vali
Keith Pearson
Albert F. Lawrence
Assignee (at issue)
Hughes Aircraft 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.