Granted Patent
Utility
US 5,844,520 · App. 06/548,674
Surveillance apparatus
Inventors:
John R. Guppy, Geoffrey Allcock
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Oct 31, 1983
Inventors
John R. Guppy
Geoffrey Allcock
Assignee (at issue)
British Aerospace Plc
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.