Granted Patent
Utility
US 4,807,142 · App. 06/659,203
Screen manager multiple viewport for a multi-tasking data processing system
Inventor:
Arun Agarwal
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Oct 9, 1984
Inventor
Arun Agarwal
Assignee (at issue)
Wang Laboratories, 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.