Granted Patent
Utility
US 5,422,945 · App. 08/092,756
Fast last digit detection of a dialed telephone number
Inventor:
Jerry Wyatt
Patented Case
View Patent ↗
Granted: Jun 6, 1995
Filed: Jul 16, 1993
Inventor
Jerry Wyatt
Assignee (at issue)
American Express TRS
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.