Granted Patent
Utility
US 5,754,640 · App. 08/566,181
Apparatus and method for qualifying telephone numbers for a telephone network
Inventor:
Thomas P. Sosnowski
Patented Case
View Patent ↗
Granted: May 19, 1998
Filed: Dec 1, 1995
Inventor
Thomas P. Sosnowski
Assignee (at issue)
Unifi Communications, Inc.
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.