Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33501 | Fire-rated beam with expansion relief section | William J. Platt, Daniel C. Ziegler | 1990-12-25 |
| 4606166 | Fire-rated beam with expansion relief section | William J. Platt, Daniel C. Ziegler | 1986-08-19 |