Granted Patent
Utility
US 4,901,348 · App. 06/812,974
Data transmission security arrangement for a plurality of data stations sharing access to a communication network
Inventors:
John M. Nichols, Richard A. Windhausen
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Dec 24, 1985
Inventors
John M. Nichols
Richard A. Windhausen
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.