Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE43398 | Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator | Theodore B. Hill, Charles C. Hill, Graham Walker | 2012-05-22 |
| 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 |
| 6651653 | Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator | Theodore B. Hill, Charles C. Hill, Graham Walker | 2003-11-25 |
| 5979440 | Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator | Theodore B. Hill, Charles C. Hill, Graham Walker | 1999-11-09 |