Issued Patents 2017
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9833644 | Air purification respirator voice amplifier | Christopher G Ziel, David A Schnellbach | 2017-12-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9833644 | Air purification respirator voice amplifier | Christopher G Ziel, David A Schnellbach | 2017-12-05 |