Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4674959 | Pressure-operated valve, particularly for a downhole pump | Douglas B. Owen | 1987-06-23 |
| 4500074 | Fluid-operated apparatus for handling and lifting loads | Robert J. Kish, Donn C. Knight | 1985-02-19 |
| 4478390 | Fluid-operated apparatus for handling and lifting loads | Donn C. Knight, Robert J. Kish | 1984-10-23 |
| 4462571 | Fluid-operated, load-handling apparatus | — | 1984-07-31 |
| 4265147 | Working pit with articulated tool arm assembly | — | 1981-05-05 |