Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4893444 | Fire expansion joint for ceiling runner | Daniel C. Ziegler | 1990-01-16 |
| 4730433 | End detail for ceiling runner | Daniel C. Ziegler | 1988-03-15 |
| 4598010 | Method of attaching a metal covering to a ceiling board | Melvin H. Shaub | 1986-07-01 |
| 4554718 | Method of reinforcing a ceiling runner | Melvin H. Shaub | 1985-11-26 |
| 4489529 | Reinforced ceiling runner | Melvin H. Shaub | 1984-12-25 |
| 4432182 | Ceiling tile suspension system | Lee W. Addie | 1984-02-21 |