Granted Patent
Utility
US 4,971,324 · App. 07/452,289
Variable position flipper mechanism for pinball games
Inventors:
Irwin J. Grabel, James A. Patla
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Dec 18, 1989
Inventors
Irwin J. Grabel
James A. Patla
Assignee (at issue)
Midway Manufacturing Company
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.