Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5267405 | Interchangeable sign system and modular digit carrier therefor | — | 1993-12-07 |
| 4977698 | Display sign system | — | 1990-12-18 |
| D279585 | Sign | Donald H. Niehaus | 1985-07-09 |
| D279587 | Character-carrier row strip for a changeable sign panel or similar article | Donald H. Niehaus | 1985-07-09 |