Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8309169 | Variable thickness shingle | Yihsien H. Teng | 2012-11-13 |
| 7805909 | Shingle with low density granules and/or backdust | Yishien H. Teng | 2010-10-05 |
| 7776391 | Variable thickness shingles | Yihsien H. Teng | 2010-08-17 |