Helmut Keller
14Patents
6h-index
19Co-inventors
63Inventor score
Filing activity: Nov 15, 1973 → Jun 25, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7089101B2 | Method for assisting a driver when performing driving maneuvers | Performing Operations; Transporting | 75 | Expired |
| US3930304A | Method and apparatus for selective burnout trimming of integrated circuit units | Emerging Cross-Sectional Technologies | 60 | Expired |
| US3987392A | Luminescent voltage indicator circuit | Electricity | 29 | Expired |
| US4054828A | Cyclically operating transistorized power switching circuit system | Electricity | 26 | Expired |
| US5409503A | Oxidation hair dye with a content of 5-aminophenyl derivatives, process for oxidative dyeing of hair and new 5-aminophenol derivatives | Human Necessities | 17 | Expired |
| US4141660A | Printer for data-processing machine having single operator station | Performing Operations; Transporting | 7 | Expired |
| US5859532A | Method of and measuring arrangement for metal detection with a coil device having several separately controllable regions | Physics | 5 | Expired |
| US5955954A | Warning and measuring device for personal protection in electromagnetic fields | Physics | 5 | Expired |
| US5675335A | Method of improving the distortion behavior of analog-to-digital converters | Electricity | 4 | Expired |
| US5877619A | Battery-operated hand field-strength meter and method of null balancing same | Physics | 2 | Expired |
| US4889716A | Method for treating herpes and chronic inflammatory intestinal tract disease | Human Necessities | 1 | Expired |
| US5865856A | 2, 5-diaminobenzonitrile compounds and oxidation hair dye compositions containing same | Chemistry; Metallurgy | 1 | Expired |
| US5935562A | Permanent process and agent | Human Necessities | 0 | Expired |
| US4957743A | Method for treating herpes | Human Necessities | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.