| Patents for G01F 23 - Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm (31,056) | 
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| 06/03/1998 | EP0612430B1 Ultrasonic transducer | 
| 06/03/1998 | CN2283274Y 电子水位传感器 Electronic level sensor | 
| 06/03/1998 | CN2283241Y Reed liquid level signal device | 
| 06/03/1998 | CN2282891Y Drop liquid level alarm device | 
| 06/02/1998 | US5760577 LC resonance circuit displacement sensor | 
| 06/02/1998 | US5760309 For use in an ultrasonic measurement system | 
| 05/28/1998 | DE19750642A1 Automatic analysis apparatus | 
| 05/28/1998 | DE19728280A1 Probe for continuous measurement of liquid level in container e.g. system | 
| 05/28/1998 | DE19648688A1 Filling level amount determination method for tank system | 
| 05/27/1998 | EP0689679B1 Process for recognizing and discriminating between useful and interfering echos in the reception signal of distance sensors working according to the pulse-echo principle | 
| 05/26/1998 | US5757988 Optical fiber sensor utilizing a swellable detector material | 
| 05/26/1998 | US5757664 Method and apparatus for monitoring operational performance of fluid storage systems | 
| 05/26/1998 | US5757390 Ink volume sensing and replenishing system | 
| 05/26/1998 | US5757320 Short range, ultra-wideband radar with high resolution swept range gate | 
| 05/26/1998 | US5756940 Weight measurement of blood volume soft-shell venous reservoirs | 
| 05/26/1998 | US5756899 Integrated sensor | 
| 05/26/1998 | US5756876 Method of setting the switching point of a capacitive level limit switch | 
| 05/26/1998 | US5755358 Toner level detection system | 
| 05/26/1998 | US5755136 Device for monitoring a predetermined level of a liquid in a container | 
| 05/26/1998 | US5755105 Air conditioning system fluid level controller | 
| 05/22/1998 | WO1998021557A1 Method for determining parameters, for example level, pressure, gas composition in closed containers | 
| 05/22/1998 | WO1998021094A1 Suction device | 
| 05/22/1998 | WO1998020996A1 Metering oven | 
| 05/20/1998 | EP0843162A2 Determining liquid volumes in cup-like vessels on a rotor having vertical deviations | 
| 05/20/1998 | EP0842504A1 Window-closing safety system | 
| 05/20/1998 | EP0842441A1 High accuracy electronic material level sensor | 
| 05/20/1998 | EP0842440A1 Short range radio locator system | 
| 05/20/1998 | EP0842402A2 Disposable electromagnetic fluid level sensor | 
| 05/20/1998 | EP0676037B1 Device for measuring the level of container contents | 
| 05/20/1998 | DE19646410A1 Absaugvorrichtung Suction | 
| 05/20/1998 | CN2282177Y Gaseous formular liquid level meter | 
| 05/20/1998 | CN1182478A Liquid level sensor | 
| 05/19/1998 | US5754609 Condensation vessel for the measurement of steam pressure, filling level and steam flow rate and method for operating a condensation vessel | 
| 05/19/1998 | US5754207 Volume indicating ink reservoir cartridge system | 
| 05/19/1998 | US5752409 Method of accurately gauging fuel in an automotive tank | 
| 05/19/1998 | CA2150855C Device for determining and/or monitoring a predetermined material level in a container | 
| 05/14/1998 | WO1998019620A1 Packaged photocurable composition | 
| 05/14/1998 | DE19714534A1 Measuring bridge-type filling level gauge | 
| 05/14/1998 | DE19647713A1 Verfahren zur Erfassung eines Pegels von flüssigem Metall A method for detecting a level of liquid metal | 
| 05/14/1998 | DE19646685A1 Verfahren zur Bestimmung von Parametern, z. B. Füllstand, Druck, Gaszusammensetzung in verschlossenen Behältern Method for the determination of parameters, such. As level, pressure, gas composition in sealed containers | 
| 05/14/1998 | DE19646300A1 Level switch for monitoring consumer water and sewage levels in containers and pipes | 
| 05/14/1998 | DE19645970A1 Capacitive level sensor for measuring filling level of liquid in container | 
| 05/13/1998 | EP0840759A1 Block copolymers | 
| 05/12/1998 | US5751611 Display device for linearly displaying a non-linear input variable | 
| 05/12/1998 | US5750881 Method and apparatus for aspirating and dispensing sample fluids | 
| 05/08/1998 | CA2190020A1 Method for determining the level of a submerged layer of liquified material | 
| 05/07/1998 | WO1998019139A1 Method and apparatus for the sonic measurement of sludge and clarity conditions during the treatment of waste water | 
| 05/07/1998 | DE19643956A1 Ultrasonic fluid level sensor for fluid in container | 
| 05/07/1998 | CA2270398A1 Method and apparatus for the sonic measurement of sludge and clarity conditions during the treatment of waste water | 
| 05/06/1998 | EP0840099A1 Device for detecting the water level in an electrical heating appliance | 
| 05/06/1998 | EP0840098A2 Fluid level detection apparatus and method for determining the volume of fluid in a container | 
| 05/06/1998 | EP0839660A1 Coupling member for cartridge in an ink-jet printer | 
| 05/06/1998 | EP0839659A1 Ink delivery system for ink-jet printing system with pressure regulator | 
| 05/05/1998 | US5748562 Level detector for solids | 
| 05/05/1998 | US5747824 Apparatus and method for sensing fluid level | 
| 05/05/1998 | US5747689 Fluid level sensing system | 
| 05/05/1998 | US5746088 Fuel system low current rheostat | 
| 04/30/1998 | WO1998017982A1 Relative location detection sensor | 
| 04/30/1998 | WO1998017981A1 Material interface level sensing | 
| 04/30/1998 | WO1998017974A1 Position sensor with magnetic coupling | 
| 04/29/1998 | EP0838668A2 Level measuring device in a container | 
| 04/29/1998 | EP0838666A1 Measuring device | 
| 04/29/1998 | EP0760087B1 Position encoder | 
| 04/28/1998 | US5745377 Method and apparatus for determining quantity of liquid in a container and/or lack of motion thereof | 
| 04/28/1998 | US5744945 Cryogenic fluid-level sensor | 
| 04/28/1998 | US5744793 Triangulation position-detection and integrated dispensing valve | 
| 04/28/1998 | US5744716 Fluid displacement level, density and concentration measurement system | 
| 04/28/1998 | US5743138 Spirally fluted float | 
| 04/28/1998 | US5743137 Magnetic float assembly | 
| 04/28/1998 | US5743136 Fluid level sensor with resistive and conductive layers | 
| 04/28/1998 | US5743135 Optical-fiber liquid-level monitor | 
| 04/28/1998 | US5743134 Method and arrangement for determining and/or monitoring a predetermined level of material in a container | 
| 04/28/1998 | US5742999 Method of assembling side-mountable liquid level sensor assembly | 
| 04/23/1998 | DE19650727A1 Measurement device | 
| 04/22/1998 | EP0837304A1 Apparatus for monitoring the level of a liquid medium in a container, especially for a bathtub | 
| 04/22/1998 | EP0837013A1 Dosing device foreseen for a dosing tube equipped with a butterfly valve | 
| 04/22/1998 | CN2279595Y Mechanical electronic type powder bin ore level meter | 
| 04/22/1998 | CN2279594Y Running water supply prompting device | 
| 04/22/1998 | CN2279593Y Bin level meter | 
| 04/22/1998 | CN2279592Y Bin level multistage display self-controlling alarmer | 
| 04/22/1998 | CN1179828A Sensor arrangement | 
| 04/16/1998 | WO1998015884A1 Apparatus for remote monitoring of the level of liquid in at least one tank | 
| 04/16/1998 | WO1998015801A1 Method for controlling the speed of a pump based on measurement of the fluid depth in a well | 
| 04/16/1998 | DE19642026A1 Capacitive fluid level detector for container | 
| 04/15/1998 | EP0836081A2 Measuring and display device for a fluid container | 
| 04/15/1998 | EP0835956A2 Pressure chamber for a water level sensor in a washing machine | 
| 04/15/1998 | CN2278928Y High accuracy colour bar liquid level meter with infrared optoelectronic switches | 
| 04/14/1998 | US5739598 Selfadjusting capacitive level switch for a non-contact or contact sensing of media or objects | 
| 04/14/1998 | US5739534 System for monitoring and adjusting the water level in a washing machine | 
| 04/14/1998 | US5737963 Ultrasonic transducer | 
| 04/09/1998 | WO1998014763A1 Process control transmitter with electrical feedthrough assembly | 
| 04/09/1998 | WO1998014762A1 Level gage waveguide transitions | 
| 04/09/1998 | WO1998014532A1 Process and device for measuring the level of bulk material containing carbon | 
| 04/09/1998 | WO1998014330A1 Method and apparatus for maintaining ink level in ink fountain of printing press | 
| 04/09/1998 | CA2267554A1 Process control transmitter with electrical feedthrough assembly | 
| 04/08/1998 | EP0834722A2 Microwave level measuring apparatus | 
| 04/08/1998 | CN2278208Y Column type fluorescent magnetic turning over liquid level gauge | 
| 04/08/1998 | CN2278207Y Magnetic liquid level measuring indication instrument | 
| 04/08/1998 | CN2278206Y Gravity type liquid level gauge | 
| 04/08/1998 | CN2278205Y Liquid level gauge with device for eliminating deformation stress |