Hellmut Freudenberg
34Patents
10h-index
55Co-inventors
78Inventor score
Filing activity: Jan 16, 1992 → Dec 19, 2012
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6016040A | Device and method for driving at least one capacitive actuator | Electricity | 26 | Expired |
| US6060814A | Device and method for driving at least one capacitive actuator | Electricity | 21 | Expired |
| US6133714A | Method of driving at least one capacitive actuator | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US6366868B2 | Method and configuration for diagnosis of a capacitive actuator | Physics | 15 | Expired |
| US6236190A | Method and device for driving a capacitive actuator | Electricity | 15 | Expired |
| US6121715A | Method and device for driving a capacitive control element | Electricity | 13 | Expired |
| US6109245A | Apparatus and method for driving a piezoelectrically controlled fuel injection valve | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US6271618A | Method and configuration for driving a capacitive actuator | Electricity | 12 | Expired |
| US6198199A | Method for diagnosing a short circuit at a capacitive actuator | Physics | 11 | Expired |
| US5986360A | Device and method for controlling at least one capacitive actuator | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US6441535B2 | Method and apparatus for driving at least one capacitive control element | Electricity | 9 | Expired |
| US6081062A | Method and device for driving at least one capacitive actuator | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US6472796B1 | Method and apparatus for controlling a capacitive actuator | Electricity | 8 | Expired |
| US6137208A | Device and method for driving a capacitive actuator | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US6212053A | Device and method for driving at least one capacitive actuator | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US6078198A | Device and method for driving a capacitive actuator | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US8198783B2 | Piezoelectric actuator with encapsulation layer having a thickness-varying property gradient | Electricity | 5 | Active |
| US7040297B2 | Method for controlling a piezo-actuated fuel-injection valve | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US6333585A | Discharge circuit for a capacitive actuator | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US6491027B1 | Method of driving a capacitive actuator of a fuel injection valve of an internal combustion engine | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US7851978B2 | Piezo actuator comprising a multilayer encapsulation, and method for the production thereof | Emerging Cross-Sectional Technologies | 3 | Active |
| US7406952B2 | Method and device for controllling an injector | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US5279275A | Process for operating an internal combustion engine | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US5301649A | Ignition device for internal combustion engines | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US6917141B2 | Device with a piezoelectric actuator | Mechanical Engineering; Lighting; Heating | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.