Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6947253 | Method for balancing a rotating assembly using eccentric rings | Michael W. Pfeiffer, David D. Koester, Eric D. Johnson, Kevin J. Spiczka | 2005-09-20 |
| 6707639 | Balancing system with adjustable eccentric rings for a disc drive assembly | Michael W. Pfeiffer, David D. Koester, Eric D. Johnson, Kevin J. Spiczka | 2004-03-16 |