Helmut Liebl
7Patents
5h-index
5Co-inventors
52Inventor score
Filing activity: Sep 17, 1974 → Feb 7, 1990
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4255661A | Electrostatic emission lens | Electricity | 54 | Expired |
| US4978855A | Electron microscope for investigation of surfaces of solid bodies | Electricity | 20 | Expired |
| US4551599A | Combined electrostatic objective and emission lens | Electricity | 17 | Expired |
| US4030573A | Apparatus driven by an electric motor | Human Necessities | 14 | Expired |
| US3935453A | Quadrupole field mass analyser | Electricity | 5 | Expired |
| US4246481A | Contact ionization apparatus | Electricity | 3 | Expired |
| US4843239A | Compact double focussing mass spectrometer | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.