Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6920730 | Multi-layered shingle and method of making same | Walter F. Becker, Shelby L. Freeman | 2005-07-26 |
| 6679020 | Multi-layered shingle and method of making same | Walter F. Becker, Shelby L. Freeman | 2004-01-20 |
| 6679308 | Multi-layered shingle and method of making same | Walter F. Becker, Shelby L. Freeman | 2004-01-20 |
| 6355132 | Multi-layered shingle and method of making same | Walter F. Becker, Shelby L. Freeman | 2002-03-12 |