Issued Patents 2023
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11765519 | Electrostatic headphone with integrated amplifier | Roger Stephen Grinnip, III | 2023-09-19 |
| 11553281 | Electrostatic headphone with integrated amplifier | Roger Stephen Grinnip, III | 2023-01-10 |