Granted Patent
Utility
US 6,735,291 · App. 09/709,592
Virtual private switched telephone network
Inventors:
Greg Schmid, Keith S. Pickens, Craig Heilmann
Patented Case
View Patent ↗
Granted: May 11, 2004
Filed: Nov 10, 2000
Inventors
Greg Schmid
Keith S. Pickens
Craig Heilmann
Assignee (at issue)
SecureLogix Corporation
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.