Granted Patent
Utility
US 5,768,686 · App. 08/616,229
Method and system for position determination using video dial tone
Inventors:
Frederick W. LeBlanc, Christopher S. Rohrer
Patented Case
View Patent ↗
Granted: Jun 16, 1998
Filed: Mar 15, 1996
Inventors
Frederick W. LeBlanc
Christopher S. Rohrer
Assignee (at issue)
U S West, 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.