Granted Patent
Utility
US 5,675,643 · App. 08/413,650
Line card that provides remote line activation and soft dialtone
Inventor:
Charles Calvin Byers
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: Mar 30, 1995
Inventor
Charles Calvin Byers
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.