Granted Patent
Utility
US 4,802,199 · App. 07/064,648
Method and apparatus for providing virtual facility communication service
Inventors:
Michael D. Lange, Nicholas K. Smith, Carl Willems
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Jun 22, 1987
Inventors
Michael D. Lange
Nicholas K. Smith
Carl Willems
Assignees (at issue)
American Telephone and Telegraph, Co.
AT&T Information Systems 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.