Granted Patent
Utility
US 4,968,040 · App. 07/394,007
Step shaped dominoes
Inventor:
Craig J. McElhaney
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Aug 15, 1989
Inventor
Craig J. McElhaney
Assignee (at issue)
The Quaker Oats 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.