Granted Patent
Utility
US 4,580,016 · App. 06/653,212
Method and apparatus for checking the integrity of a communications channel in a voice store and forward system
Inventor:
Michael Williamson
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Sep 24, 1984
Inventor
Michael Williamson
Assignee (at issue)
VMX, Inc.
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.