Granted Patent
Utility
US 4,924,491 · App. 07/273,285
Arrangement for obtaining information about abandoned calls
Inventors:
Merle F. Compton, Vincent D. Vanacore, Brian W. Walsh
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Nov 18, 1988
Inventors
Merle F. Compton
Vincent D. Vanacore
Brian W. Walsh
Assignee (at issue)
American Telephone and Telegraph, Co.
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.