Granted Patent
Utility
US 4,548,408 · App. 06/492,416
Bonus ball pinball game
Inventor:
Norman R. Clark
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: May 6, 1983
Inventor
Norman R. Clark
Assignee (at issue)
Bally Manufacturing Corporation
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.