Granted Patent
Utility
US 4,642,450 · App. 06/861,425
Punching stylus for handicapped users
Inventor:
John E. Ahmann
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: May 9, 1986
Inventor
John E. Ahmann
Assignee (at issue)
Election Supplies Limited
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.