Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6772705 | Variable buoyancy apparatus for controlling the movement of an object in water | John J. Engel | 2004-08-10 |
| 5746543 | Volume control module for use in diving | — | 1998-05-05 |