Granted Patent
Utility
US 6,115,457 · App. 08/990,109
Marking and screening telephone calls
Inventor:
Matthew R. Holiday
Patented Case
View Patent ↗
Granted: Sep 5, 2000
Filed: Dec 12, 1997
Inventor
Matthew R. Holiday
Assignee (at issue)
Northern Telcom Limited
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.