Granted Patent
Utility
US 5,172,113 · App. 07/781,892
System and method for transmitting data in an optical traffic preemption system
Inventor:
Steven M. Hamer
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Oct 24, 1991
Inventor
Steven M. Hamer
Assignee (at issue)
Minnesota Mining and Manufacturing 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.