Granted Patent
Utility
US 4,992,998 · App. 07/406,283
Acoustic range finding system
Inventor:
Steven J. Woodward
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Sep 12, 1989
Inventor
Steven J. Woodward
Assignee (at issue)
Federal Industries Industrial Group Inc.
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.