Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5108679 | Process for the production of concrete building products | Eric Rirsch | 1992-04-28 |
| 5106557 | Process for the production of concrete building products | Eric Rirsch | 1992-04-21 |