Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6827853 | Manually controlled skimming of industrial oil contaminants | David Walker | 2004-12-07 |
| 6790370 | Manually controlled skimming of industrial oil contaminants | David Walker | 2004-09-14 |