Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4690580 | Ring binder mechanism with mating rings | — | 1987-09-01 |
| 4678357 | Device for binding holed sheets | Siegfried Oevermann | 1987-07-07 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4690580 | Ring binder mechanism with mating rings | — | 1987-09-01 |
| 4678357 | Device for binding holed sheets | Siegfried Oevermann | 1987-07-07 |