Granted Patent
Utility
US 4,924,449 · App. 07/337,648
Acoustic sub-surface interrogator
Inventor:
Jacques Y. Guigné
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Apr 13, 1989
Inventor
Jacques Y. Guigné
Assignee (at issue)
Nordco 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.