Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6698423 | Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator | Theodore B. Hill, Charles C. Hill, Graham Walker | 2004-03-02 |
| 6681764 | Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator | Theodore B. Hill, Charles C. Hill, Graham Walker | 2004-01-27 |