Granted Patent
Utility
US 4,496,800 · App. 06/506,742
Ringing generator testing arrangement for a digital telephone network
Inventor:
John Stewart Young
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Jun 22, 1983
Inventor
John Stewart Young
Assignee (at issue)
GTE Automatic Electric Incorporated
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.