Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5888008 | Writing instrument with refillable reservoir | Udo Obersteller | 1999-03-30 |
| 4979840 | Fountain pen with correction-cartridge receiver | Batto Madaus | 1990-12-25 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5888008 | Writing instrument with refillable reservoir | Udo Obersteller | 1999-03-30 |
| 4979840 | Fountain pen with correction-cartridge receiver | Batto Madaus | 1990-12-25 |