Granted Patent
Utility
US 5,606,593 · App. 08/342,187
Apparatus and method for automatically returning a telephone set to an on-hook condition
Inventor:
David B. Smith
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: Nov 18, 1994
Inventor
David B. Smith
Assignee (at issue)
LUCENT TECHNOLOGIES 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.