Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5657603 | Preparing sheet metal and fabricating roofing shingles | Robert R. Goodhart, William E. Carnahan | 1997-08-19 |
| 5495654 | Preparing sheet metal and fabricating roofing shingles | Robert R. Goodhart, William E. Carnahan | 1996-03-05 |