Hellfried Karpf
15Patents
12h-index
23Co-inventors
74Inventor score
Filing activity: Apr 17, 1987 → Apr 14, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5157262A | Sensor element for determination of concentration of substances | Physics | 104 | Expired |
| US5353792A | Sensing device | Human Necessities | 104 | Expired |
| US5039490A | Sensor element for determination of concentration of substances | Physics | 64 | Expired |
| US4755667A | Sensor element for determination of concentration of substances | Physics | 56 | Expired |
| US5779978A | Measuring assembly for luminescence analysis | Physics | 51 | Expired |
| US5372936A | Method for detecting biological activities in a specimen | Emerging Cross-Sectional Technologies | 50 | Expired |
| US5368027A | Sensor arrangement for direct or indirect optical determination of physical or chemical properties | Human Necessities | 44 | Expired |
| US5266486A | Method and apparatus for detecting biological activities in a specimen | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5128019A | Device for measuring chemical and physical parameters of a liquid or gaseous medium | Physics | 17 | Expired |
| US5217875A | Method for detecting biological activities in a specimen and a device for implementing the method | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5351563A | One-way measuring element for analyzing gaseous or liquid samples | Physics | 14 | Expired |
| US5308581A | Substance of an optical fluorescence measuring arrangement for measuring the pH of a sample and optical sensor with such an indicator substance | Physics | 14 | Expired |
| US5228350A | Method for analyzing gaseous or liquid samples and a one-way measuring element for use in such a method | Physics | 11 | Expired |
| US5723340A | Optical indicator for determining the activity of an ion in a sample | Physics | 2 | Expired |
| US6139798A | Sensor membrane of an optical sensor | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.