Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888053 | Chloride leaching of iron-based, heavy metal-containing sludges | Gerard Grayson | 1989-12-19 |
| 4869066 | Method for the production of usable steam and non-toxic solids from geothermal brine | D. Stephen Pye, John L. Featherstone, Darrell L. Gallup, Gregory A. Gritters, Daniel Hoyer | 1989-09-26 |