Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4252901 | System and process for anaerobic digestion | David Fischer, John C. Thomas, Edward J. Worthington, Jr. | 1981-02-24 |
| 4248972 | Stacked modules for anaerobic digestion | David Fischer, John C. Thomas, Edward J. Worthington, Jr. | 1981-02-03 |