Granted Patent
Utility
US 4,293,841 · App. 05/930,576
Pedestrian traffic control system
Inventor:
Thomas Potter
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Aug 3, 1978
Inventor
Thomas Potter
Assignee (at issue)
Detector Systems, Inc.
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.