| Force display master interface device for teleoperation SL Springer US Patent 6,435,794, 2002 | 93 | 2002 |
| Automatic outrigger for a vehicle SL Springer US Patent 6,394,738, 2002 | 79 | 2002 |
| Design and control of a force-reflecting haptic interface for teleoperational grasping SL Springer, NJ Ferrier J. Mech. Des. 124 (2), 277-283, 2002 | 59 | 2002 |
| Releasable locking device SL Springer, DA Spence US Patent 5,297,921, 1994 | 57 | 1994 |
| Wheel-activated vehicle restraint system SL Springer, N Hahn, H Van De Wiel, M Boon, F De Beer US Patent 5,762,459, 1998 | 54 | 1998 |
| Wheel activated vehicle restraint SL Springer, N Hahn US Patent 5,582,498, 1996 | 54 | 1996 |
| Manually positioned wheel chocking apparatus N Hahn, SL Springer US Patent 6,092,970, 2000 | 53 | 2000 |
| Vehicle-activated safety leg control system for a dock leveler assembly SL Springer, N Hahn, MA Swessel US Patent 5,440,772, 1995 | 52 | 1995 |
| Vehicle restraining device SL Springer, N Hahn US Patent 5,375,965, 1994 | 52 | 1994 |
| Drive screw system with nested mobile supports SL Springer US Patent 5,531,557, 1996 | 49 | 1996 |
| Dock leveler with an improved automatic material handling vehicle barrier SL Springer, N Hahn US Patent 5,311,628, 1994 | 40 | 1994 |
| Manually positioned wheel chocking apparatus N Hahn, SL Springer US Patent 6,524,053, 2003 | 39 | 2003 |
| Vehicle restraining device SL Springer, N Hahn US Patent 6,238,163, 2001 | 30 | 2001 |
| Safety leg system for dock leveler SL Springer US Patent 6,276,016, 2001 | 29 | 2001 |
| State-of-the-art virtual reality hardware for computer-aided design SL Springer, R Gadh Journal of Intelligent Manufacturing 7, 457-465, 1996 | 28 | 1996 |
| Lip extension and control device for dock levelers S Springer US Patent 5,323,503, 1994 | 27 | 1994 |
| Self-unlatching dock leveler lip with dampened descent SL Springer US Patent 6,311,352, 2001 | 26 | 2001 |
| Vehicle restraining device SL Springer, N Hahn US Patent 6,676,360, 2004 | 23 | 2004 |
| Wheel-activated vehicle restraint system SL Springer, N Hahn, H Van De Wiel, M Boon, F De Beer US Patent App. 09/215,565, 2002 | 23 | 2002 |
| Haptic feedback for virtual reality computer aided design SL Springer, R Gadh ASME International Mechanical Engineering Congress and Exposition 18190, 1-8, 1997 | 13 | 1997 |
