Granted Patent
Utility
US 4,933,967 · App. 07/359,828
Automatically-effected move of a subscriber between electronic message service systems in a network
Inventors:
Stella Y. Lo, John R. Lothrop, Steven Spearman, Mary L. Warren
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Jun 1, 1989
Inventors
Stella Y. Lo
John R. Lothrop
Steven Spearman
Mary L. Warren
Assignee (at issue)
AT&T CORP.
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.