Granted Patent
Utility
US 5,322,283 · App. 08/020,767
Rotary ball receptacle for a pinball game
Inventors:
Mark D. Ritchie, John W. Skalon
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Feb 22, 1993
Inventors
Mark D. Ritchie
John W. Skalon
Assignee (at issue)
Williams Electronics Games, 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.