Siegfried Zenker
21Patents
8h-index
14Co-inventors
72Inventor score
Filing activity: Jan 9, 1989 → May 2, 2011
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6220289A | Hydraulic valve arrangement with locking and floating function | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4981159A | Hydraulic control valve with pressure sensing means | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5000001A | Dual load-sensing passage adjustable relief valves for hydraulic motor control | Emerging Cross-Sectional Technologies | 13 | Expired |
| US8020583B2 | Hydraulic valve arrangement | Emerging Cross-Sectional Technologies | 13 | Active |
| US4955194A | Damping arrangement for damping the oscillations of valve controlled by pressure fluid | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US6854270B2 | Hydraulic valve system | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US6499505B2 | Hydraulic valve arrangement | Emerging Cross-Sectional Technologies | 9 | Expired |
| US6427721B1 | Hydraulic valve arrangement with locking function | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5979498A | Three-way or multi-way valve | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6712176B2 | Hydraulic dual circuit steering system | Performing Operations; Transporting | 5 | Expired |
| US5323687A | Hydraulic circuit | Mechanical Engineering; Lighting; Heating | 5 | Expired |
| US7770596B2 | Hydraulic valve arrangement | Emerging Cross-Sectional Technologies | 5 | Active |
| US5947441A | Two-way seat-type valve | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US6805161B2 | Hydraulic valve system | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6971407B2 | Hydraulic valve arrangement | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5647394A | Control valve | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5337778A | Pressure control valve | Emerging Cross-Sectional Technologies | 2 | Expired |
| US7975598B2 | Hydraulic valve arrangement | Mechanical Engineering; Lighting; Heating | 1 | Active |
| US8528460B2 | Hydraulic valve arrangement | Mechanical Engineering; Lighting; Heating | 0 | Active |
| US8444110B2 | Valve arrangement | Emerging Cross-Sectional Technologies | 0 | Active |
| US6490963B2 | Hydraulic line coupling arrangement | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.