Issued Patents 2018
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9988768 | System, method, and apparatus to restrict movement of railway guard bar | Phillip R. Merrifield | 2018-06-05 |
| 9932054 | Double point derail switch | Phillip R. Merrifield, Russell R. Hein | 2018-04-03 |