Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9208759 | Compound-resonance driver (CRD) bass enhancement system | — | 2015-12-08 |
| 7968780 | Method and apparatus for optimizing sound output characteristics of a drum | Jesse M. Bradman, William ‘Billy’ L. Johnson | 2011-06-28 |
| 7928303 | Insert for cajon drum | Jesse M. Bradman | 2011-04-19 |
| 7582820 | Method and apparatus for optimizing sound output characteristics of a bass drum | Jesse M. Bradman, William (Billy) L. Johnson | 2009-09-01 |