Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D449592 | Stereophone ear plug insert | Michael J. Koss, Allan G. Mlodzikowski | 2001-10-23 |
| D444141 | Stereophone ear plug housing | Michael J. Koss, Allan G. Mlodzikowski | 2001-06-26 |
| D435036 | Stereophone ear plug | Michael J. Koss, Allan G. Mlodzikowski | 2000-12-12 |