Serco
31Patents
1Active
31Granted
34Portfolio score
Filing activity: Aug 16, 1988 → Apr 11, 2017
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5396676A | Vertically storing dock leveler | Performing Operations; Transporting | 60 | Expired |
| US5459963A | Safety gate for loading docks | Fixed Constructions | 56 | Expired |
| US5460460A | Scissors lift dock leveler | Performing Operations; Transporting | 52 | Expired |
| US4988254A | Vehicle restraint | Performing Operations; Transporting | 49 | Expired |
| US5026242A | Automatic vehicle restraint | Performing Operations; Transporting | 48 | Expired |
| US5088143A | Dock leveler lip actuation mechanism | Performing Operations; Transporting | 46 | Expired |
| US5001799A | Seal carried by a vertically storing dock leveler | Performing Operations; Transporting | 36 | Expired |
| US5071306A | Vehicle restraint | Performing Operations; Transporting | 34 | Expired |
| US5120181A | Vehicle restraint | Performing Operations; Transporting | 33 | Expired |
| US5313681A | Vertically storing dock leveler | Performing Operations; Transporting | 31 | Expired |
| US5096359A | Vehicle restraint actuator | Performing Operations; Transporting | 29 | Expired |
| US4937906A | Variable lip throw-out for dockboard | Performing Operations; Transporting | 25 | Expired |
| US5454682A | Vehicle restraint | Performing Operations; Transporting | 23 | Expired |
| US4974276A | Dock leveler hold-down with variable position safety legs | Performing Operations; Transporting | 23 | Expired |
| US4928340A | Dock leveler | Performing Operations; Transporting | 22 | Expired |
| US5336033A | Vehicle restraint | Performing Operations; Transporting | 22 | Expired |
| US5117526A | Vertically storing dock leveler | Performing Operations; Transporting | 22 | Expired |
| US4977635A | Control circuit for vertically storing dock leveler | Performing Operations; Transporting | 21 | Expired |
| US5346353A | Vehicle restraint | Performing Operations; Transporting | 21 | Expired |
| US5259718A | Vehicle restraint | Performing Operations; Transporting | 16 | Expired |
| US5303443A | Dock leveler hold-down system | Performing Operations; Transporting | 14 | Expired |
| US5048246A | Wedge seal for loading dock shelter | Performing Operations; Transporting | 13 | Expired |
| US5097557A | Trapezoidal beam dock leveler | Performing Operations; Transporting | 13 | Expired |
| US4979253A | Hydraulic circuit for control of lip of vertically storing dock leveler | Performing Operations; Transporting | 12 | Expired |
| US5157801A | Dock leveler having automatically actuated vehicle barrier | Performing Operations; Transporting | 10 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.