Granted Patent
Utility
US 6,018,121 · App. 09/058,722
Method and apparatus for simulating a jam session and instructing a user in how to play the drums
Inventor:
John Devecka
Patented Case
View Patent ↗
Granted: Jan 25, 2000
Filed: Apr 10, 1998
Inventor
John Devecka
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.