Granted Patent
Utility
US 4,975,945 · App. 07/396,157
Universal telephone call relay system
Inventor:
Kenneth Carbullido
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Aug 21, 1989
Inventor
Kenneth Carbullido
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.