Hartmann & Braun Aktiengesellschaft
55Patents
0Active
55Granted
36Portfolio score
Filing activity: Nov 29, 1974 → Oct 24, 1996
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4581701A | Monitoring plural process control stations | Physics | 45 | Expired |
| US4902138A | Measuring component concentration in a gas blend | Physics | 35 | Expired |
| US5357340A | Method for spectroscopy using two Fabry-Perot interference filters | Physics | 29 | Expired |
| US4287764A | Fluid analyzer construction and housing | Physics | 28 | Expired |
| US5218422A | Interferometric analyzer for multiple substance detection | Physics | 23 | Expired |
| US4435849A | Optical transmission system | Electricity | 21 | Expired |
| US5077469A | Calibrating a nondispersive infrared gas analyzer | Physics | 20 | Expired |
| US4176963A | Device for determining the nitrogen oxide concentration in a gaseous mixture | Physics | 19 | Expired |
| US4281248A | Nondispersive infrared gas analyzer | Physics | 16 | Expired |
| US5292666A | Method for the measurement of the total content of organic carbon and nitrogen in water | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4496840A | Nondispersive infrared gas analyzer | Physics | 12 | Expired |
| US4220415A | Construction for photometric analyzer | Physics | 12 | Expired |
| US5085087A | Sampling corrosive fluid | Physics | 11 | Expired |
| US4410854A | Flame ionization detector | Physics | 10 | Expired |
| US4999013A | Controllable interferometer | Physics | 10 | Expired |
| US4288693A | Nondispersive infrared gas analyzer | Physics | 10 | Expired |
| US4035734A | Noise suppression in measuring signals | Electricity | 10 | Expired |
| US4063891A | Method for determining the inorganic carbon content of aqueous liquids | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5059026A | Interferometric device having a controllable Fabry-Perot | Physics | 9 | Expired |
| US5403452A | Method for determining gas concentrations and gas sensor with a solid electrolyte | Physics | 9 | Expired |
| US5340542A | Apparatus for the measurement of the total content of organic carbon and nitrogen in water | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4180732A | Nondispersive infrared gas analyzer | Physics | 9 | Expired |
| US3937962A | Correction of two beam photometer for fluid analysis | Physics | 8 | Expired |
| US3970387A | Nondispersion, two beam, infrared gas analyzer | Physics | 8 | Expired |
| US4373137A | Radiation detection and receiving in nondispersive infrared gas analyzer | Physics | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.