Granted Patent
Utility
US 4,680,717 · App. 06/651,480
Microprocessor controlled loop detector system
Inventor:
Marshall H. Martin
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Sep 17, 1984
Inventor
Marshall H. Martin
Assignee (at issue)
Indicator Controls 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.