Granted Patent
Utility
US 6,570,970 · App. 09/861,460
Calling-party-pays call processing for cellular and paging
Inventors:
Carol Shifrin Gruchala, Gordon Lynn Blumenschein, Douglas Marshall, Roger Albert Sosa, Carlos Donoso
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: May 18, 2001
Inventors
Carol Shifrin Gruchala
Gordon Lynn Blumenschein
Douglas Marshall
Roger Albert Sosa
Carlos Donoso
Assignee (at issue)
AMERITECH 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.