Granted Patent
Utility
US 4,538,140 · App. 06/363,854
Fiber optic acoustic transducer intrusion detection system
Inventor:
David J. Prestel
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Mar 31, 1982
Inventor
David J. Prestel
Assignee (at issue)
Gould 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.