Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4543158 | Sheet type felt | Alfredo A. Bondoc, Frederick W. Sieling | 1985-09-24 |
| 4513045 | Sheet type felt | Alfredo A. Bondoc, Frederick W. Sieling | 1985-04-23 |
| 4472243 | Sheet type roofing | Alfredo A. Bondoc, Frederick W. Sieling | 1984-09-18 |