Granted Patent
Utility
US 5,562,284 · App. 08/430,353
Game ticket with multiple-level exposure device
Inventor:
Mark Stevens
Patented Case
View Patent ↗
Granted: Oct 8, 1996
Filed: Apr 28, 1995
Inventor
Mark Stevens
Assignee (at issue)
International Gamco, 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.