Granted Patent
Utility
US 5,670,937 · App. 08/441,754
Line monitor for two wire data transmission
Inventors:
Robert W. Right, Hilario Costa
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: May 16, 1995
Inventors
Robert W. Right
Hilario Costa
Assignee (at issue)
Federal Signal Corporation
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.