Granted Patent
Utility
US 5,793,857 · App. 08/534,290
Method of using dynamic database to improve telephone number portability
Inventors:
Stephen Barnes, James Bartoszewicz, Ronald Schwartz, Krishnamurthy Giridharagopal
Patented Case
View Patent ↗
Granted: Aug 11, 1998
Filed: Sep 27, 1995
Inventors
Stephen Barnes
James Bartoszewicz
Ronald Schwartz
Krishnamurthy Giridharagopal
Assignee (at issue)
Nortel Networks Limited
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.