Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6712087 | Rotary valve assembly for pressure swing adsorption system | Theodore B. Hill, Charles C. Hill | 2004-03-30 |
| 6457485 | Rotary valve assembly for pressure swing absorption system | Theodore B. Hill, Charles C. Hill | 2002-10-01 |
| 6311719 | Rotary valve assembly for pressure swing adsorption system | Theodore B. Hill, Charles C. Hill | 2001-11-06 |