Granted Patent
Utility
US 6,802,717 · App. 10/127,995
Teaching method and device
Inventor:
Felix Castro
Patented Case
View Patent ↗
Granted: Oct 12, 2004
Filed: Apr 23, 2002
Inventor
Felix Castro
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.