Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7637062 | Panel section for sound barrier | — | 2009-12-29 |
| 5406039 | Sectional acoustical barrier wall system | Martin E. Rohn | 1995-04-11 |
| 4935301 | Coated glass fiber composites | Evelyn N. Drake, Ilan Duvdevani | 1990-06-19 |
| 4923517 | Glass fiber reinforced cement compositions | Evelyn N. Drake, Ilan Duvdevani | 1990-05-08 |