Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5642108 | Chordic keyboard system for generating a signal in response to a chord that is assigned using a correlation based on a composite chord-difficulty index | John Hilburn, David Vicknair | 1997-06-24 |
| 5493654 | Chordic keyboard system for generating a signal in response to a chord that is assigned using a correlation based on a composite chord-difficulty index | John Hilburn, David Vicknair | 1996-02-20 |