Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7566044 | Coupling | Frank R. Frola, Raymond C. Hoffman | 2009-07-28 |
| 7550031 | Cylinder filling oxygen concentrator | Donald W. Hunter, Frank R. Frola | 2009-06-23 |
| 6393802 | Cylinder filler for use with an oxygen concentrator | Greg Clites, Frank R. Frola, Jesse C. Moore | 2002-05-28 |