Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7036521 | Air conserving slide valve | — | 2006-05-02 |
| 6669758 | Variable inlet air restriction for composition control of product gas | Russell F. Hart | 2003-12-30 |
| 6409807 | Linear gas valve cycle control, shut-off-valve and self test | Kevin Michael Dailey | 2002-06-25 |
| 5858063 | Oxygen concentrator with beds' duty cycle control and self-test | Tuan Q. Cao, Russell F. Hart, William David Molis, Richard Kent Frantz, Victor P. Crome | 1999-01-12 |