Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D720468 | Sample collection device assembly | David A. Calderwood, Joy Parr Drach, Rodolfo Rodriguez, Mitchell Hockett, Randall Marcuson +4 more | 2014-12-30 |
| 5851386 | Waste-oil cleaning apparatus | — | 1998-12-22 |
| 5676840 | Waste-oil cleaning method and apparatus | — | 1997-10-14 |