Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889771 | Method of preserving wood with lanthanide derivatives | Peter S. Gradeff | 1989-12-26 |
| 4836830 | Rare earth compositions for diesel fuel stabilization | Peter S. Gradeff | 1989-06-06 |