Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9758970 | Laminated hip and ridge shingle | Lawrence J. Grubka, Jeffrey Wayne Smith | 2017-09-12 |
| 9482007 | Flexible laminated hip and ridge shingle | Lawrence J. Grubka, James E. Loftus, Donn R. Vermilion, Jason D. Guerra | 2016-11-01 |
| D755997 | Shingle | Lawrence J. Grubka | 2016-05-10 |
| 9290943 | Hip and ridge roofing shingle | Lawrence J. Grubka, Hyun Gun Yu, Hun Joo Song | 2016-03-22 |
| 9017791 | Shingle blank having formation of individual hip and ridge roofing shingles | Lawrence J. Grubka | 2015-04-28 |
| 8245482 | Method of attaching cap shingles on a roof ridge | Lawrence J. Grubka, Brian R. Ray | 2012-08-21 |