Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6003545 | Gas flow control device for high purity, highly corrosive gas service | Sande Dukas, John Friedrichs, Robert N. Cooper, David Durkin | 1999-12-21 |
| 5904178 | Gas filter for regulator valve, and improved regulator valve employing the filter | Christopher Bracey, John Friedrichs | 1999-05-18 |
| 5687949 | Gas flow regulator valve | Sander G. Dukas, Robert N. Cooper, Michael D. Heck | 1997-11-18 |