| 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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| 08/03/1989 | DE3801658A1 Method for determining a quantity of flowing liquid |
| 08/02/1989 | EP0325705A2 Displacement-measuring apparatus |
| 08/01/1989 | US4853901 Automatic liquid level recording device |
| 08/01/1989 | US4853718 On chip conductive fluid sensing circuit |
| 08/01/1989 | US4853694 Electronic tank level monitoring device |
| 08/01/1989 | US4852404 Liquid level detector |
| 07/27/1989 | DE3802225A1 Liquid-level measuring arrangement |
| 07/26/1989 | EP0324733A1 A moisture indicator. |
| 07/26/1989 | EP0324731A1 A method of indicating the time of an acoustic pulse and a device for carrying out the method. |
| 07/26/1989 | CN2041809U Suspension type liquid level gauge |
| 07/26/1989 | CN2041808U Charge level incicator |
| 07/26/1989 | CN2041807U Penetrance, reflection type two-colour tank gage |
| 07/25/1989 | US4852054 Volumetric leak detection system for underground storage tanks and the like |
| 07/25/1989 | US4851831 Two-wire level measuring instrument |
| 07/25/1989 | US4851817 Fiber optic probe system |
| 07/25/1989 | US4850222 Sensor unit |
| 07/25/1989 | US4850213 Filling level measuring device for measuring the filling level of explosive or aggressive media in a container |
| 07/19/1989 | CN2041423U Auto-controlled type double-colour fluviograph |
| 07/19/1989 | CN1034059A Torsion chain type level position transducer |
| 07/18/1989 | US4849739 Liquid detector for air pressure type fire sprinkler system |
| 07/18/1989 | US4848150 Apparatus for measuring small changes in liquid level in a container |
| 07/18/1989 | US4848149 Apparatus for measuring the level of liquid fuel in a tank |
| 07/13/1989 | WO1989006346A1 Tank level gauge with servo-controlled feeler |
| 07/12/1989 | EP0323943A2 Production process for variable electrical resistors, and resistors obtained by this process |
| 07/11/1989 | US4847623 Radar tank gauge |
| 07/11/1989 | US4847600 Son-air detector |
| 07/11/1989 | US4846701 Interconnecting a logic device to discrete components |
| 07/11/1989 | US4846572 Moisture indicator |
| 07/11/1989 | US4846003 Acoustic impedance system for pipette tip detection |
| 07/11/1989 | US4845986 Liquid level indication device |
| 07/05/1989 | CN2040638U High and middle pressure double colour fluviograph |
| 07/05/1989 | CN1033698A Optical part comprising optical fiber and light element or receiving element and method for making same |
| 07/04/1989 | USH652 Sensor for detection of liquid spills on surfaces |
| 07/04/1989 | US4845486 Residential fuel-oil level reporting and alarm system |
| 07/04/1989 | US4845469 Device for electrically monitoring oil level, particularly in automobile internal combustion engines |
| 07/04/1989 | US4844870 Liquid monitoring |
| 07/04/1989 | US4843883 Differential pressure fluid level sensor |
| 07/04/1989 | US4843876 Liquid level indicator |
| 07/04/1989 | CA1256978A1 Device for detecting the presence of a gas in a liquid contained in an enclosure |
| 06/29/1989 | DE3840430A1 Device for determining the filling level of a liquid in a container |
| 06/29/1989 | DE3742854A1 Sight-glass for monitoring level in containers |
| 06/29/1989 | DE3742783A1 Device for measuring liquid level in liquid containers, especially the oil level in the internal combustion engines of motor vehicles |
| 06/28/1989 | EP0322281A1 Measuring device for the storage parameters, e.g. level, temperature, of fluids in a container having differing densities |
| 06/28/1989 | EP0322264A1 Apparatus for extracting a sample and measuring the flow of a liquid in a constant or pulsed circulation |
| 06/28/1989 | EP0322001A2 Apparatus for adjusting level of liquid to be filled into packaging tube |
| 06/28/1989 | EP0321485A1 Distance and temperature measuring system for remote locations. |
| 06/28/1989 | CN2040246U Magnetic level meter |
| 06/28/1989 | CN2040245U Level meter for liquified-gas bottle |
| 06/28/1989 | CN2040244U Combined dichromatic fluriograph |
| 06/28/1989 | CN2040070U Filling position sensor for potted cement |
| 06/27/1989 | US4841771 Fuel level sensor |
| 06/27/1989 | US4841770 Apparatus and method for determining the amount of substance in a vessel |
| 06/27/1989 | CA1256301A1 Capacitance-type material level indication |
| 06/21/1989 | EP0190178B1 Device for electromagnetic measurement of the filling of metallurgical vessels |
| 06/21/1989 | CN2039834U Anti-explosive double colour liquid level gauge |
| 06/20/1989 | US4841227 Apparatus for the ratiometric measurement of a quantity of liquid in a tank |
| 06/20/1989 | US4841107 Device for indicating the filling level in a fluid reservoir |
| 06/20/1989 | US4840137 Liquid level gauging apparatus |
| 06/20/1989 | US4840064 Liquid volume monitoring apparatus and method |
| 06/20/1989 | US4840056 Fuel measuring system |
| 06/15/1989 | WO1989005443A1 Liquid level sensor |
| 06/15/1989 | WO1989005442A1 Non-intrusive acoustic liquid level sensor |
| 06/14/1989 | EP0320197A2 Liquid sensor |
| 06/14/1989 | EP0319826A2 Movement sensor to be employed as pressure or fluid level gauge |
| 06/13/1989 | US4839590 Piezoelectric actuator for magnetostrictive linear displacement measuring device |
| 06/13/1989 | US4839515 Fiber optic transducer with fiber-to-fiber edge coupling |
| 06/13/1989 | US4838303 Buoyancy operable liquid level sensor for controlling an alarm pressure fluid supply responsive to changes of liquid level in a pressure vessel |
| 06/13/1989 | US4838083 Float activated gauge |
| 06/13/1989 | US4838082 Fuel gauge damper circuit |
| 06/13/1989 | US4838071 Method of determining the filling capacity of and calibrating a pneumatic conveying arrangement |
| 06/13/1989 | CA1255512A1 Head for a bubble tube |
| 06/07/1989 | EP0318917A2 Vibrating unit for a level limit switch |
| 06/07/1989 | EP0318672A2 Device for checking the level and the movement of a mass in a vibrating machine |
| 06/07/1989 | CN1004444B Acoustic method and its equipment for detecting the location of cumulative water in pipelines |
| 06/06/1989 | US4836632 Fiber optic liquid level sensor |
| 06/06/1989 | US4836022 Bi-color fluviograph of transmission and reflection type |
| 06/06/1989 | US4836018 Rain gauge with improved syphon discharge |
| 06/01/1989 | DE3804558A1 Circuit element |
| 05/31/1989 | EP0317736A2 Surface tension measuring method and concentration controlling device utilizing a surface tensiometer |
| 05/30/1989 | US4833919 Device for measuring displacement |
| 05/30/1989 | US4833918 Sensor and method for ullage level and flow detection |
| 05/24/1989 | EP0316584A1 Purging pipe |
| 05/24/1989 | EP0316564A1 Filling level indicator |
| 05/24/1989 | EP0316534A1 Circuit element |
| 05/24/1989 | DE3737695A1 Schauglas-armatur Sight glass fitting |
| 05/24/1989 | DE3737204A1 Device for the dosed transfer of liquids |
| 05/24/1989 | DE3736208A1 Liquid level measuring arrangement |
| 05/23/1989 | US4833441 Reservoir with a reed switch |
| 05/23/1989 | US4833321 Process for installing a probe for monitoring the position of an interface between two fluids and means for implementing said process |
| 05/23/1989 | US4831878 Structure for mounting liquid level meter |
| 05/23/1989 | US4831877 Adjustable liquid level indicator |
| 05/23/1989 | CA1254400A1 Method and system for measurement of liquid level in a tank |
| 05/18/1989 | WO1989004465A1 Optical fluid level sensor |
| 05/16/1989 | US4831565 Process control equipment for adverse environments |
| 05/16/1989 | US4830212 Working machine |
| 05/16/1989 | US4829825 Multiple diaphragm probe seal |
| 05/16/1989 | US4829820 Visual indicator |
| 05/09/1989 | US4827770 Sight glass with inner surface wiper |
| 05/09/1989 | US4827769 Fuel level sensor with buried conductor |
| 05/09/1989 | US4827768 Motor-driven material level indicator |