Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11085187 | Shingle with abraded nail line | Lawrence J. Grubka | 2021-08-10 |
| 8557366 | Roofing shingle including sheet as headlap | Edward R. Harrington, Larry Grubka, Yihsein H. Teng, Jill Krueger, Venkata S. Nagarajan +2 more | 2013-10-15 |