Granted Patent
Utility
US 6,199,861 · App. 09/303,710
Method and kit for retrofitting a pinball machine
Inventors:
Bradley A. Hume, Thomas W. Uban
Patented Case
View Patent ↗
Granted: Mar 13, 2001
Filed: Apr 30, 1999
Inventors
Bradley A. Hume
Thomas W. Uban
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.