Granted Patent
Utility
US 5,423,539 · App. 08/083,875
Slot machine with payout modifying symbols
Inventor:
Yuji Nagao
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Jun 30, 1993
Inventor
Yuji Nagao
Assignee (at issue)
SIGMA CORPORATION
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.