Granted Patent
Utility
US 5,247,490 · App. 07/893,478
Pressure-compensated optical acoustic sensor
Inventors:
Charles A. Goepel, Frederick M. Reitz
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Jun 4, 1992
Inventors
Charles A. Goepel
Frederick M. Reitz
Assignee (at issue)
LOCKHEED MARTIN 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.