Granted Patent
Utility
US 5,839,902 · App. 08/791,989
Electronic geography teaching device
Inventor:
Michael C. Wood
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Jan 31, 1997
Inventor
Michael C. Wood
Assignee (at issue)
Knowledge Kids Enterprises, 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.