David Johnsen
8Patents
6h-index
11Co-inventors
52Inventor score
Filing activity: Apr 24, 1996 → Jul 22, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5671679A | Fully automatic, multiple operation rail maintenance apparatus | Fixed Constructions | 46 | Expired |
| US6095053A | Bulk spike loading system | Fixed Constructions | 16 | Expired |
| US6863717B2 | Plate handling system and a method of removing plates from rail ties | Fixed Constructions | 16 | Expired |
| US7066277B2 | Robotic sod stacker | Emerging Cross-Sectional Technologies | 11 | Expired |
| US7070004B2 | Robotic sod stacker | Emerging Cross-Sectional Technologies | 10 | Expired |
| US6622633B1 | Railroad machine centering system | Fixed Constructions | 7 | Expired |
| US6755135B2 | Combined tie extractor and plate remover for rail maintenance | Fixed Constructions | 5 | Expired |
| US6832558B2 | Riding rail tie plugging apparatus | Fixed Constructions | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.