Granted Patent
Utility
US 6,120,021 · App. 09/231,092
Lock-down bar release system for a pinball machine
Inventors:
Peter J. Piotrowski, John R. Krutsch, George A. Gomez, James A. Patla, Charles R. Bleich
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Jan 14, 1999
Inventors
Peter J. Piotrowski
John R. Krutsch
George A. Gomez
James A. Patla
Charles R. Bleich
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.