Granted Patent
Utility
US 6,553,116 · App. 09/389,258
System and method for early detection of area code changes
Inventor:
David A. Vander Meiden
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Sep 3, 1999
Inventor
David A. Vander Meiden
Assignee (at issue)
Siemens Information and Communication Networks, 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.