Granted Patent
Utility
US 4,993,045 · App. 07/264,914
Modem diagnostic loop
Inventor:
LAZARO ALFONSO
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Oct 31, 1988
Inventor
LAZARO ALFONSO
Assignee (at issue)
Racal Data Communications, 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.