Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D841728 | Circular piano | Charles E. Johnson, David T. Starkey | 2019-02-26 |
| 9679542 | Circular piano keyboard | Charles E. Johnson, Kareem Devlin Byrne, Richard Fell, James M. Behmke | 2017-06-13 |
| 8952232 | Circular piano keyboard | Charles E. Johnson, Kareem Devlin Byrne, Richard Fell, James M. Behmke | 2015-02-10 |