Granted Patent
Utility
US 4,739,128 · App. 06/928,993
Thumb-controlled, hand-held joystick
Inventor:
Michael Grisham
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Nov 10, 1986
Inventor
Michael Grisham
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Bell Laboratories
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.