Granted Patent
Utility
US 5,263,570 · App. 07/939,292
Conveyor belt emergency stop indicator light system
Inventor:
Wayne Stonemark
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Aug 31, 1992
Inventor
Wayne Stonemark
Assignee (at issue)
General Chemical 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.