Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6977052 | Check disk for optical data storage disk manufacturing | Ted L. Bahns, Donald J. Kerfeld | 2005-12-20 |
| 6821460 | Two-sided replication of data storage media | Donald J. Kerfeld | 2004-11-23 |