Granted Patent
Utility
US 4,471,659 · App. 06/509,942
Optical vibration sensor
Inventors:
Eric Udd, Richard F. Cahill
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jul 1, 1983
Inventors
Eric Udd
Richard F. Cahill
Assignee (at issue)
McDonnell Douglas Corporation
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.