Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE43885 | Practice drumhead assembly | Thomas Rogers | 2013-01-01 |
| 7781661 | Drumhead assembly | Thomas Rogers | 2010-08-24 |
| 7514617 | Practice drumhead assembly | Thomas Rogers | 2009-04-07 |
| 5988869 | Agitator for orbital agitation | Jeffrey Bruce Davidson, Ilya Feygin | 1999-11-23 |
| 5336959 | Impact zone detection device | Kyung-Tae Park | 1994-08-09 |
| 5034648 | Dual direction switch | — | 1991-07-23 |
| 4904222 | Synchronized sound producing amusement device | Edward Tom | 1990-02-27 |
| 4870868 | Vibration sensing apparatus | Edward Tom | 1989-10-03 |
| 4841256 | Piezoelectric phase locked loop circuit | — | 1989-06-20 |