Granted Patent
Utility
US 5,896,560 · App. 08/631,866
Transmit control system using in-band tone signalling
Inventors:
Steve Pfiefer, Donald R. Bauman, James K. Lyon
Patented Case
View Patent ↗
Granted: Apr 20, 1999
Filed: Apr 12, 1996
Inventors
Steve Pfiefer
Donald R. Bauman
James K. Lyon
Assignee (at issue)
Transcrypt Internationall E. F. Johnson 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.