Granted Patent
Utility
US 5,051,723 · App. 07/414,701
Signalling system with ambient condition reference monitoring
Inventors:
George E. Long, Daniel R. Asmussen, Martin Kenney
Patented Case
View Patent ↗
Granted: Sep 24, 1991
Filed: Sep 29, 1989
Inventors
George E. Long
Daniel R. Asmussen
Martin Kenney
Assignee (at issue)
George E. Long
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.