Granted Patent
Utility
US 5,659,608 · App. 08/574,418
Line feed circuit with logic level controlled ringing
Inventor:
Richard Frank Stiefel
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Dec 15, 1995
Inventor
Richard Frank Stiefel
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.