Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5794539 | Moisture barrier filter seal for hopper rail car hatches | Michael A. Ott, Charles Hendee | 1998-08-18 |
| 5628254 | Moisture barrier, filter seal for hopper rail car hatches | Michael A. Ott, Charles Hendee | 1997-05-13 |
| 4902173 | System and filter for preventing contamination of particulate material in railroad car during transportation and unloading | Michael A. Click, Ralph E. Gerstung | 1990-02-20 |