Granted Patent
Utility
US 5,479,501 · App. 08/134,497
Far-end disconnect detector for telephony systems
Inventor:
Daniel T. Lai
Patented Case
View Patent ↗
Granted: Dec 26, 1995
Filed: Oct 8, 1993
Inventor
Daniel T. Lai
Assignee (at issue)
Rolm Systems
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.