Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5221386 | Cement board having reinforced edges | Robert P. Ensminger, Ludwig Wenzlow-Lukasch | 1993-06-22 |
| 4916004 | Cement board having reinforced edges | Robert P. Ensminger, Ludwig Wenzlow-Lukasch | 1990-04-10 |
| 4238238 | Calcining kettle having means for returning stack exhaust gas to calcining mixture | William A. Kinkade | 1980-12-09 |