Assignee

VAISALA OY

FI70 patents

Top patents by PatentIndex Score

US5561523AOct 1, 1996

Electrically tunable fabry-perot interferometer produced by surface micromechanical techniques for use in optical material analysis

VAISALA OY229 citations98

US5646729AJul 8, 1997

Single-channel gas concentration measurement method and apparatus using a short-resonator Fabry-Perot interferometer

VAISALA OY209 citations97

US4335613AJun 22, 1982

Apparatus for indicating the freezing of the surface of an asphalt road, paved runway, or the like

VAISALA OY166 citations97

US4609966ASep 2, 1986

Electrical impedance detector for measurement of physical quantities, in particular of temperature

VAISALA OY65 citations94

US4295091AOct 13, 1981

Circuit for measuring low capacitances

VAISALA OY59 citations94

US5801647ASep 1, 1998

Method and apparatus for measuring road surface conditions

VAISALA OY95 citations92

US5750903AMay 12, 1998

Method of linearizing a flow velocity sensor, a linearized flow velocity measurement apparatus and system

VAISALA OY24 citations92

US5679902AOct 21, 1997

Surface-micromachined symmetrical differential pressure sensor with electrodes patterned into multiple conducting areas

VAISALA OY41 citations92

US5641911AJun 24, 1997

Method and apparatus for feedback-control of an asymmetric differential pressure transducer

VAISALA OY43 citations92

US5625139AApr 29, 1997

Method of measuring concentration of nonpolar gases such as carbon dioxide by means of a polymer-based sensor and concentration sensor structure

VAISALA OY22 citations92

US5619144AApr 8, 1997

Detector and method for observation of the presence of a liquid and/or of a change of phase in same

VAISALA OY25 citations92

US5531128AJul 2, 1996

Capacitive transducer feedback-controlled by means of electrostatic force and method for controlling the profile of the transducing element in the transducer

VAISALA OY31 citations92

US5369278ANov 29, 1994

Calibration method for gas concentration measurements

VAISALA OY21 citations92

US5075816ADec 24, 1991

Capacitive humidity sensor construction and method for manufacturing the sensor

VAISALA OY31 citations92

US4875134AOct 17, 1989

Pressure sensor construction and method for its fabrication

VAISALA OY39 citations92

US4831492AMay 16, 1989

Capacitor construction for use in pressure transducers

VAISALA OY37 citations92

US5644080AJul 1, 1997

Method of measuring dewpoint or gas concentration and apparatus for prediction of icing

VAISALA OY37 citations91

US5053784AOct 1, 1991

Apparatus and method for measuring the azimuth and elevation of an object

VAISALA OY27 citations91

US4164868AAug 21, 1979

Capacitive humidity transducer

VAISALA OY42 citations91

US5511417AApr 30, 1996

Method and arrangement in measurement of humidity, in particular in radiosondes

VAISALA OY22 citations90

US4628403ADec 9, 1986

Capacitive detector for absolute pressure

VAISALA OY42 citations90

US4594639AJun 10, 1986

Capacitive pressure detector

VAISALA OY33 citations90

US5835216ANov 10, 1998

Method of controlling a short-etalon fabry-perot interferometer used in an NDIR mearsurement apparatus

VAISALA OY42 citations89

US5485747AJan 23, 1996

Method of measurement of relative humidity, in particular in radiosondes, and humidity detectors that make use of the method

VAISALA OY19 citations89

US5116124AMay 26, 1992

Measurement system for scattering of light

VAISALA OY22 citations89

US5033284AJul 23, 1991

Calibration method for gas or vapor relative concentration sensor

VAISALA OY25 citations89

US4500940AFeb 19, 1985

Capacitive humidity sensor and method for the manufacture of same

VAISALA OY28 citations89

US5880836AMar 9, 1999

Apparatus and method for measuring visibility and present weather

VAISALA OY46 citations88

US5504577AApr 2, 1996

Method and apparatus for measuring meteorological visibility and scattering of light, said apparatus utilizing common optics for transmission and reception

VAISALA OY20 citations88

US4378168AMar 29, 1983

Dew point detection method and device

VAISALA OY44 citations87

US5511418AApr 30, 1996

Method for measurement of relative humidity, in particular in radiosondes, and humidity detectors that make use of the method

VAISALA OY18 citations79

US4751654AJun 14, 1988

Method of and arrangement for measuring impedances in measuring circuits having programmed memory

VAISALA OY20 citations79

US4745803AMay 24, 1988

Method and apparatus for determining the covering on a road surface

VAISALA OY19 citations78

US4229776AOct 21, 1980

Capacitive capsule for aneroid pressure gauge

VAISALA OY24 citations78

USD314155SJan 29, 1991

Humidity and temperature meter

VAISALA OY18 citations77

US4924064AMay 8, 1990

Method for trimming a planar capacitor

VAISALA OY22 citations75

US5160843ANov 3, 1992

Apparatus and method for measuring gas concentrations

VAISALA OY9 citations74

US4991424AFeb 12, 1991

Integrated heatable sensor

VAISALA OY16 citations74

US4928530AMay 29, 1990

Pressure transducer

VAISALA OY19 citations74

US4862317AAug 29, 1989

Capacitive pressure transducer

VAISALA OY15 citations74

US4597027AJun 24, 1986

Capacitive pressure detector structure and method for manufacturing same

VAISALA OY14 citations74

US5987963ANov 23, 1999

Method of improving the selectivity of a polymer-film gas sensor and a sensor structure for implementing the method

VAISALA OY9 citations73

US5607564AMar 4, 1997

Method of producing a microporous, gas permeable electrode structure and a microporous, gas permeable electrode structure

VAISALA OY10 citations73

US4794266ADec 27, 1988

Method and apparatus for light transmission measurement by sending light, measuring received light and computing transmittance

VAISALA OY11 citations73

US5156045AOct 20, 1992

Method related to impedance detectors in radiosondes

VAISALA OY13 citations72

US5083234AJan 21, 1992

Multilayer transducer with bonded contacts and method for implementation of bonding

VAISALA OY7 citations72

Showing the top 50 of 70 patents by PatentIndex Score.

VAISALA OY

Top patents by PatentIndex Score

Electrically tunable fabry-perot interferometer produced by surface micromechanical techniques for use in optical material analysis

Single-channel gas concentration measurement method and apparatus using a short-resonator Fabry-Perot interferometer

Apparatus for indicating the freezing of the surface of an asphalt road, paved runway, or the like

Absolute pressure transducer

Method and device in the antenna and receiving system of a radio theodolite

Electrically modulatable thermal radiant source with specific filament

Infrared detector with Fabry-Perot interferometer

Electrical impedance detector for measurement of physical quantities, in particular of temperature

Circuit for measuring low capacitances

Method and apparatus for measuring road surface conditions

Method of linearizing a flow velocity sensor, a linearized flow velocity measurement apparatus and system

Surface-micromachined symmetrical differential pressure sensor with electrodes patterned into multiple conducting areas

Method and apparatus for feedback-control of an asymmetric differential pressure transducer

Method of measuring concentration of nonpolar gases such as carbon dioxide by means of a polymer-based sensor and concentration sensor structure

Detector and method for observation of the presence of a liquid and/or of a change of phase in same

Capacitive transducer feedback-controlled by means of electrostatic force and method for controlling the profile of the transducing element in the transducer

Calibration method for gas concentration measurements

Capacitive humidity sensor construction and method for manufacturing the sensor

Pressure sensor construction and method for its fabrication

Capacitor construction for use in pressure transducers

Method of measuring dewpoint or gas concentration and apparatus for prediction of icing

Apparatus and method for measuring the azimuth and elevation of an object

Capacitive humidity transducer

Method and arrangement in measurement of humidity, in particular in radiosondes

Capacitive detector for absolute pressure

Capacitive pressure detector

Method of controlling a short-etalon fabry-perot interferometer used in an NDIR mearsurement apparatus

Method of measurement of relative humidity, in particular in radiosondes, and humidity detectors that make use of the method

Measurement system for scattering of light

Calibration method for gas or vapor relative concentration sensor

Capacitive humidity sensor and method for the manufacture of same

Apparatus and method for measuring visibility and present weather

Method and apparatus for measuring meteorological visibility and scattering of light, said apparatus utilizing common optics for transmission and reception

Dew point detection method and device

Method for measurement of relative humidity, in particular in radiosondes, and humidity detectors that make use of the method

Method of and arrangement for measuring impedances in measuring circuits having programmed memory

Method and apparatus for determining the covering on a road surface

Capacitive capsule for aneroid pressure gauge

Humidity and temperature meter

Method for trimming a planar capacitor

Apparatus and method for measuring gas concentrations

Integrated heatable sensor

Pressure transducer

Capacitive pressure transducer

Capacitive pressure detector structure and method for manufacturing same

Method of improving the selectivity of a polymer-film gas sensor and a sensor structure for implementing the method

Method of producing a microporous, gas permeable electrode structure and a microporous, gas permeable electrode structure

Method and apparatus for light transmission measurement by sending light, measuring received light and computing transmittance

Method related to impedance detectors in radiosondes

Multilayer transducer with bonded contacts and method for implementation of bonding