Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D575390 | Exhalation valve filter | Derek A. Parkin, Abigail L. Curtis, Lawrie D. Coote | 2008-08-19 |
| D550837 | Frame that supports an exhalation valve filter | Derek A. Parkin, Abigail L. Curtis, Lawrie D. Coote | 2007-09-11 |