Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5485881 | Groundwater sampler | Per Hagen Nielsen, Bent Skov | 1996-01-23 |
| 5392853 | Plugging system for boreholes | — | 1995-02-28 |
| 5255945 | End-to-end jointing system for tubes and pipes | — | 1993-10-26 |
| 5195583 | Borehole packer | Douglas J. Belshaw | 1993-03-23 |
| 5048605 | Packing-seal for boreholes | Peter F. Kuryllowicz, Douglas J. Belshaw, John A. Cherry, Paul E. Johnson | 1991-09-17 |
| 5031452 | Water level probe | Andrew R. Dobson, Douglas J. Belshaw | 1991-07-16 |
| 4989452 | Liquid-level detector | Douglas J. Belshaw | 1991-02-05 |
| 4928541 | Groundwater sampling apparatus | Douglas J. Belshaw | 1990-05-29 |
| 4902976 | Probe for detecting the presence of magnetic material in a ground hole | Douglas J. Belshaw, Peter F. Kuryllowicz | 1990-02-20 |