VAISALA OYJ
125Patents
31Active
125Granted
47Portfolio score
Filing activity: Jul 22, 1975 → Jul 20, 2022 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5561523A | Electrically tunable fabry-perot interferometer produced by surface micromechanical techniques for use in optical material analysis | Physics | 166 | Expired |
| US4335613A | Apparatus for indicating the freezing of the surface of an asphalt road, paved runway, or the like | Physics | 154 | Expired |
| US5646729A | Single-channel gas concentration measurement method and apparatus using a short-resonator Fabry-Perot interferometer | Physics | 151 | Expired |
| US5644676A | Thermal radiant source with filament encapsulated in protective film | Electricity | 123 | Expired |
| US5801647A | Method and apparatus for measuring road surface conditions | Physics | 79 | Expired |
| US5010343A | Method and device in the antenna and receiving system of a radio theodolite | Physics | 72 | Expired |
| US6791311B2 | Lightning detection and data acquisition system | Physics | 67 | Expired |
| US5589689A | Infrared detector with Fabry-Perot interferometer | Physics | 61 | Expired |
| US6788043B2 | Lightning detection and data acquisition system | Physics | 54 | Expired |
| US5827438A | Electrically modulatable thermal radiant source with specific filament | Electricity | 52 | Expired |
| US4295091A | Circuit for measuring low capacitances | Physics | 51 | Expired |
| US5483414A | Electrical impedance detector for measurement of physical quantities, in particular of temperature | Physics | 49 | Expired |
| US5500569A | Electrically modulatable thermal radiant source and method for manufacturing the same | Electricity | 47 | Expired |
| US4609966A | Absolute pressure transducer | Electricity | 41 | Expired |
| US6868339B2 | Systems and methods for time corrected lightning detection | Physics | 36 | Expired |
| US4164868A | Capacitive humidity transducer | Physics | 34 | Expired |
| US5818586A | Miniaturized fabry-perot spectrometer for optical analysis | Physics | 33 | Expired |
| US5880836A | Apparatus and method for measuring visibility and present weather | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4628403A | Capacitive detector for absolute pressure | Physics | 32 | Expired |
| US6735525B1 | Systems and methods for spectral corrected lightning detection | Physics | 30 | Expired |
| US8448507B2 | Method and device for detecting hydrometeors | Physics | 29 | Active |
| US4594639A | Capacitive pressure detector | Physics | 29 | Expired |
| US7249502B2 | Precipitation/hail sensor and method for precipitation rate measurement | Physics | 29 | Expired |
| US4831492A | Capacitor construction for use in pressure transducers | Physics | 27 | Expired |
| US5641911A | Method and apparatus for feedback-control of an asymmetric differential pressure transducer | Physics | 25 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.