Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6431006 | Soil testing assemblies | Robert Henke | 2002-08-13 |
| 5931237 | Soil testing assemblies | Robert Henke, Malcolm C. Minor | 1999-08-03 |
| 5203824 | Method and apparatus for preparing the surface of a region of soil for further testing | Robert Henke | 1993-04-20 |
| 4594899 | Method and apparatus for testing soil | Robert Henke | 1986-06-17 |