Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5013172 | Writing utensil with spacer ring | — | 1991-05-07 |
| 4645367 | Writing implement venting system | Otto Mutschler | 1987-02-24 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5013172 | Writing utensil with spacer ring | — | 1991-05-07 |
| 4645367 | Writing implement venting system | Otto Mutschler | 1987-02-24 |