Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5319901 | Bifurcated column joint system for electrical transmission tower | David W. Johnson, George Korzeniowski | 1994-06-14 |
| 5285613 | Pultruded joint system and tower structure made therewith | David W. Johnson | 1994-02-15 |