Granted Patent
Utility
US 4,975,889 · App. 07/207,744
Acoustic ranging apparatus and method
Inventors:
Steven Petrucelli, Stephen A. Orbine, III
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Jun 16, 1988
Inventors
Steven Petrucelli
Stephen A. Orbine, III
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.