Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8353339 | Apparatus for the measuring of fluid levels and pumping of the same | David R. Hill | 2013-01-15 |
| 8281853 | Tool for use in well monitoring | David R. Hill | 2012-10-09 |
| 7750815 | Portable monitoring apparatus with over the air programming and sampling volume collection cavity | — | 2010-07-06 |
| 6085836 | Well pump control using multiple sonic level detectors | David R. Hill, Karl F. Scheucher | 2000-07-11 |