Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10165352 | Ambient sonic low-pressure equalization | Karl Cartwright | 2018-12-25 |
| 10158932 | Ambient sonic low-pressure equalization | Karl Cartwright | 2018-12-18 |
| 8333260 | Deep insertion vented earpiece system | John A. Hall, Karl Cartwright | 2012-12-18 |
| 7784583 | Deep insertion vented earpiece system | John A. Hall, Karl Cartwright | 2010-08-31 |