Granted Patent
Utility
US 4,887,069 · App. 07/116,587
Perimeter intrusion detection system with block ranging capabilities
Inventors:
Melvin C. Maki, Walter J. Feller, Edward L. Adams
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Nov 4, 1987
Inventors
Melvin C. Maki
Walter J. Feller
Edward L. Adams
Assignee (at issue)
Control Data Canada Limited
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.