Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7182308 | Concrete form connecting apparatus | Douglas E. Trimmer, Danny R. Dugger, Launnie Kelmel, James L. Brockman | 2007-02-27 |
| 5759429 | Apparatus for interconnecting concrete forms | Douglas E. Trimmer, James Otto Mittelstadt | 1998-06-02 |
| 5251868 | Connector pin assembly for concrete form panel units | James E. Trimmer | 1993-10-12 |