Granted Patent
Utility
US 5,415,402 · App. 08/236,966
Magnetic ball-walker for a pinball game
Inventors:
Robert S. Morrison, Edward F. Hicks
Patented Case
View Patent ↗
Granted: May 16, 1995
Filed: May 2, 1994
Inventors
Robert S. Morrison
Edward F. Hicks
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.