Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5908122 | Sway control method and system for rotary cranes | Gordon G. Parker, John T. Feddema, Clark R. Dohrmann, Ben J. Petterson | 1999-06-01 |
| 5785191 | Operator control systems and methods for swing-free gantry-style cranes | John T. Feddema, Ben J. Petterson | 1998-07-28 |
| 5596254 | Two-axis angular effector | Mark R. Vaughn, John Roux Phelan, Don M. Van Zuiden | 1997-01-21 |