Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10589966 | Jib coupling system for jib stowage | — | 2020-03-17 |
| 7337912 | Automatically deployable boom extension and method of deploying same | — | 2008-03-04 |
| 5927520 | Electro-hydraulic operating system for extensible boom crane | Henry D. Barthalow, Claude R. Zimmerman | 1999-07-27 |
| 5911239 | Metering valve | Henry D. Barthalow, Claude R. Zimmerman | 1999-06-15 |
| 5111945 | Boom extension alignment device | Henry D. Barthalow | 1992-05-12 |