Granted Patent
Utility
US 4,862,492 · App. 07/262,975
Measurement of transmission quality of a telephone channel
Inventor:
Nicholas Zwick
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Oct 26, 1988
Inventor
Nicholas Zwick
Assignee (at issue)
Dialogic 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.