Granted Patent
Utility
US 5,867,573 · App. 08/597,592
Telephone handset interface with feedback control
Inventor:
Brian Albert Wittman
Patented Case
View Patent ↗
Granted: Feb 2, 1999
Filed: Feb 6, 1996
Inventor
Brian Albert Wittman
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.