Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D452920 | Roof tile | Alfonso V. Alvarez, Eric Martin Hahn, Walter Arthur Schreifels, Joseph Edward Smith, Patrick Gene Sullivan | 2002-01-08 |
| 6247284 | Roof tile design and construction | Alfonso V. Alvarez, Eric Martin Hahn, Walter Arthur Schreifels, Joseph Edward Smith, Patrick Gene Sullivan | 2001-06-19 |
| 5974756 | Roof tile design and construction | Alfonso V. Alvarez, Eric Martin Hahn, Walter Arthur Schreifels, Joseph Edward Smith, Patrick Gene Sullivan | 1999-11-02 |
| D411316 | Roof tile | Alfonso V. Alvarez, Eric Martin Hahn, Walter Arthur Schreifels, Joseph Edward Smith, Patrick Gene Sullivan | 1999-06-22 |