Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6691822 | Sound damping filter, ear protector, and method for manufacturing a membrane for a sound damping | Ronald Collee | 2004-02-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6691822 | Sound damping filter, ear protector, and method for manufacturing a membrane for a sound damping | Ronald Collee | 2004-02-17 |