Granted Patent
Utility
US 5,690,331 · App. 08/698,033
Four-faced die
Inventor:
William A. Sides
Patented Case
View Patent ↗
Granted: Nov 25, 1997
Filed: Aug 7, 1996
Inventor
William A. Sides
Assignee (at issue)
TSR Co., Ltd.
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.