Granted Patent
Utility
US 5,577,113 · App. 08/525,964
Apparatus and method for virtual private telephone line with automatic ring down
Inventors:
Paul M. Bray, Douglas R. Cardy, Charles P. Shelton
Patented Case
View Patent ↗
Granted: Nov 19, 1996
Filed: Sep 8, 1995
Inventors
Paul M. Bray
Douglas R. Cardy
Charles P. Shelton
Assignee (at issue)
DSC Communications 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.