Granted Patent
Utility
US 5,440,291 · App. 08/084,721
Intruder detection system for passageways and the like
Inventors:
Melvin P. Foster, Jr., James M. Woodward
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Jul 1, 1993
Inventors
Melvin P. Foster, Jr.
James M. Woodward
Assignee (at issue)
Lockheed 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.