Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881487 | Fluid level sensing method and apparatus | — | 1989-11-21 |
| 4872356 | Resistivity probe fixture | Jay D. Barnett, Bryan Ludwig, Ernest E. Marks | 1989-10-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881487 | Fluid level sensing method and apparatus | — | 1989-11-21 |
| 4872356 | Resistivity probe fixture | Jay D. Barnett, Bryan Ludwig, Ernest E. Marks | 1989-10-10 |