Granted Patent
Utility
US 4,339,748 · App. 06/138,311
Multiple range passive infrared detection system
Inventors:
John K. Guscott, Robert B. Powers
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Apr 8, 1980
Inventors
John K. Guscott
Robert B. Powers
Assignee (at issue)
American District Telegraph Company
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.