Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4525751 | Disc record with tapered groove | Edward J. Freeman, John Economou, Gunter John, Jerome Barth Halter, Jack E. James +2 more | 1985-06-25 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4525751 | Disc record with tapered groove | Edward J. Freeman, John Economou, Gunter John, Jerome Barth Halter, Jack E. James +2 more | 1985-06-25 |