Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5922950 | Depth-discrete sampling port | Christopher P. May, Joseph Rossabi, Brian D. Riha, Ralph L. Nichols | 1999-07-13 |
| 5889217 | Process and apparatus for obtaining samples of liquid and gas from soil | Joseph Rossabi, Christopher P. May, Jim Shinn, Keith R. Sprague | 1999-03-30 |
| 5775424 | Depth-discrete sampling port | Christopher P. May, Joseph Rossabi, Brian D. Riha, Ralph L. Nichols | 1998-07-07 |
| 5641245 | Apparatus for passive removal of subsurface contaminants | Christopher P. May, Joseph Rossabi | 1997-06-24 |