Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8211350 | Method and apparatus for molding roofing products with back gating | Dan Robinson | 2012-07-03 |
| 8099923 | Roofing shingle with a laying line | Randal J. Jolitz, Charles Doyle Ziulkowski | 2012-01-24 |
| 7882677 | Roofing shingle with a laying line | Randal J. Jolitz, Charles Doyle Ziulkowski | 2011-02-08 |
| 7700028 | Method for manufacturing roofing products | Randal J. Jolitz, Charles Doyle Ziulkowski | 2010-04-20 |
| 7661947 | Method and apparatus for molding roofing products with back gating | Dan Robinson | 2010-02-16 |
| 7516593 | Roofing shingle with a laying line | Randal J. Jolitz, Charles Doyle Ziulkowski | 2009-04-14 |
| 7475516 | Roofing shingle with a laying line | Randal J. Jolitz, Charles Doyle Ziulkowski | 2009-01-13 |
| 6935089 | Methods of manufacturing roofing products | Randal J. Jolitz, Charles Doyle Ziulkowski | 2005-08-30 |