Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4631866 | Composite non-handed door jamb construction | John J. Kempel | 1986-12-30 |
| 4518026 | Energy efficient garage door construction and the like | John J. Kempel | 1985-05-21 |
| 4379480 | Energy efficient garage door construction and the like | John J. Kempel | 1983-04-12 |