Granted Patent
Utility
US 4,445,865 · App. 06/458,064
Method of teaching mathematics
Inventor:
Jeffrey Sellon
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Jan 14, 1983
Inventor
Jeffrey Sellon
Assignee (at issue)
Cuisenaire Company of America, 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.