Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D293477 | Translucent building block or the like | Francis J. Zavada | 1987-12-29 |
| 4651486 | Translucent block for wall and column structures | Kenneth J. Erickson, Francis J. Zavada | 1987-03-24 |