Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4302344 | Loose-fill, thermal insulation | David L. Ruff | 1981-11-24 |
| 4212755 | Settle resistant loose-fill perlite insulation comprising particles rendered slightly tacky by a coating thereon | David L. Ruff | 1980-07-15 |