Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6305403 | Aeration apparatus for a vertical riser in a vacuum drainage system | Douglas M. Wallace, Jay D. Stradinger | 2001-10-23 |
| 6283140 | Waste fluid discharge column | Douglas M. Wallace | 2001-09-04 |
| 6152160 | Modular vacuum drainage system | Ruth J. Bowden Wilcox, Tom Beatty, Doug Wallace, Mark A. Pondelick, Ian Tinkler | 2000-11-28 |