Granted Patent
Utility
US 5,251,252 · App. 07/779,762
Telephone interface call processing system with call selectivity
Inventor:
Ronald A. Katz
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Oct 21, 1991
Inventor
Ronald A. Katz
Assignee (at issue)
FIRST DATA RESOURCES, LLC.
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.