Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11766944 | Mutli-fuel, range extending power generation propulsion system, method and apparatus | Matthew D. Van Steenwyk, Kenneth Losch, Chuck Coppa, Mike Schiltz, Don Wilkins | 2023-09-26 |
| 4582205 | Modularized pedestal-mount crane and method of disassembly | Gerald P. Berger, Frank S. Foster, IV, Leroy L. Wittman | 1986-04-15 |
| 4537317 | Heavy duty travel crane | — | 1985-08-27 |
| 4483448 | Heavy duty crane | Leroy L. Wittman | 1984-11-20 |
| 4436169 | Elevating and tilting mechanism for crane cab | Dennis A. Jennerjohn | 1984-03-13 |
| 4421241 | Removable live mast and hoist unit | Leroy L. Wittman | 1983-12-20 |
| 4394911 | Heavy duty crane | Leroy L. Wittman | 1983-07-26 |
| 4273244 | Crane upperstructure self-transferring system | Leroy L. Wittman | 1981-06-16 |