Granted Patent
Utility
US 5,894,504 · App. 08/733,245
Advanced call waiting and messaging system
Inventors:
Joseph Anderson Alfred, Allen Eisdorfer, Jerry Eisdorfer, Christopher Gregory Harrington
Patented Case
View Patent ↗
Granted: Apr 13, 1999
Filed: Oct 2, 1996
Inventors
Joseph Anderson Alfred
Allen Eisdorfer
Jerry Eisdorfer
Christopher Gregory Harrington
Assignee (at issue)
AT&T CORP.
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.