Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4901652 | Accumulating and conveying incinerator ash | John R. Petersen, Michael Keller | 1990-02-20 |
| 4900244 | Gas flaring method and apparatus | Michael Keller, Roger K. Noble | 1990-02-13 |
| 4798150 | Apparatus for handling ash | Michael Keller, Robert E. Schwartz | 1989-01-17 |