Granted Patent
Utility
US 6,580,718 · App. 09/199,235
Method and apparatus for preventing unauthorized use of a permanent virtual connection
Inventor:
Donald Chapman
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Nov 24, 1998
Inventor
Donald Chapman
Assignee (at issue)
Covad Communications Company
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.