Granted Patent
Utility
US 5,109,409 · App. 07/451,501
Apparatus and method to detect telephony signaling states
Inventors:
Eric D. Bomgardner, Randall J. Eisenach
Patented Case
View Patent ↗
Granted: Apr 28, 1992
Filed: Dec 15, 1989
Inventors
Eric D. Bomgardner
Randall J. Eisenach
Assignees (at issue)
Alcatel NA, Inc.
Artwork 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.