Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8210205 | Rotary valve assembly | — | 2012-07-03 |
| 5917135 | Gas concentration sensor and control for oxygen concentrator utilizing gas concentration sensor | Homayoun Birangi | 1999-06-29 |
| 5906672 | Closed-loop feedback control for oxygen concentrator | Homayoun Birangi, David D. Polaseck | 1999-05-25 |
| 5513899 | Seat cushion for wheelchairs | David D. Polacsek | 1996-05-07 |
| 5397443 | Method of assembling tubular electrochemical oxygen generators | — | 1995-03-14 |
| 5186793 | Oxygen concentrator utilizing electrochemical cell | — | 1993-02-16 |
| 5169506 | Oxygen concentration system utilizing pressurized air | — | 1992-12-08 |