Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4667768 | Sound absorbing panel | — | 1987-05-26 |
| 4600078 | Sound barrier | — | 1986-07-15 |
| RE31275 | Zeno duct sound attenuating means | — | 1983-06-14 |
| 4371054 | Flow duct sound attenuator | — | 1983-02-01 |
| 4364691 | Surface wave attenuation apparatus | — | 1982-12-21 |
| 4303144 | Apparatus for the retroreflection of sound | — | 1981-12-01 |
| 4303520 | Surface extraction apparatus | — | 1981-12-01 |
| 4236598 | Rotating self-cleaning sound absorber for ducts | — | 1980-12-02 |
| 4228867 | Noise barrier | — | 1980-10-21 |