Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10612698 | Pipe with embedded wire | Douglas G. Everson | 2020-04-07 |
| 9958091 | Pipe with embedded wire | Douglas G. Everson | 2018-05-01 |
| 9341289 | Corrugated drainage pipe with protuberances | Douglas G. Everson | 2016-05-17 |
| 7661903 | Low-pressure dosing system for sewage disposal and associated methods | Douglas G. Everson, Marc H. Maroschak, Scott M. Thomson | 2010-02-16 |
| 5520481 | Drain field system | Frederic Atchley | 1996-05-28 |
| 5516229 | Drain field system | Frederic Atchley | 1996-05-14 |
| 4681684 | Universal septic tank fitting | Frederick P. Atchley, Douglas G. Everson | 1987-07-21 |