Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8099923 | Roofing shingle with a laying line | Dennis Carlson, Charles Doyle Ziulkowski | 2012-01-24 |
| 7882677 | Roofing shingle with a laying line | Dennis Carlson, Charles Doyle Ziulkowski | 2011-02-08 |
| 7823334 | Ridge cap roofing product | — | 2010-11-02 |
| 7716894 | Starter block roofing product | — | 2010-05-18 |
| 7700028 | Method for manufacturing roofing products | Dennis Carlson, Charles Doyle Ziulkowski | 2010-04-20 |
| 7516593 | Roofing shingle with a laying line | Dennis Carlson, Charles Doyle Ziulkowski | 2009-04-14 |
| 7475516 | Roofing shingle with a laying line | Dennis Carlson, Charles Doyle Ziulkowski | 2009-01-13 |
| 7178294 | Ridge cap roofing product | — | 2007-02-20 |
| 6935089 | Methods of manufacturing roofing products | Dennis Carlson, Charles Doyle Ziulkowski | 2005-08-30 |
| 6933037 | Triple laminate roofing shingle | Leonard D. McCumber, Virginia K. Coleman | 2005-08-23 |
| D462461 | Hip and ridge cover | Stanley P. Frankoski | 2002-09-03 |
| 5822943 | Hurricane resistant shingle | Stanley P. Frankoski | 1998-10-20 |
| 5102463 | Flame retardant asphalt composition | Donald R. Kirk | 1992-04-07 |
| 5026747 | Flame retardant asphalt composition | Donald R. Kirk | 1991-06-25 |
| 4804696 | Flame retardant asphalt composition | Donald R. Kirk | 1989-02-14 |