Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880443 | Molecular sieve oxygen concentrator with secondary oxygen purifier | George W. Miller | 1989-11-14 |
| 4813979 | Secondary oxygen purifier for molecular sieve oxygen concentrator | George W. Miller | 1989-03-21 |