Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5817398 | Method and apparatus for manufacturing bands of bituminized roofing | — | 1998-10-06 |
| 5000999 | Bituminous roof covering material | — | 1991-03-19 |
| 4940501 | Method of manufacturing a perforated roofing material | — | 1990-07-10 |
| 4874652 | Perforated roofing material and a method of manufacturing the same | — | 1989-10-17 |
| 4819848 | Apparatus for making perforated roofing material | — | 1989-04-11 |