| 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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| 02/19/1991 | US4994780 Heated extended resistance temperature sensor, apparatus for sensing and method of making same |
| 02/19/1991 | US4994749 Liquid sensor with high sensitivity near empty |
| 02/19/1991 | US4994682 Fiber optic continuous liquid level sensor |
| 02/19/1991 | US4993754 Liquid level coplanar transmitter adapter |
| 02/19/1991 | US4993264 Passive acoustics process to monitor fluidized bed level |
| 02/13/1991 | EP0412580A1 Level indicator |
| 02/13/1991 | EP0412266A1 Liquid level sensor for fuel containers |
| 02/12/1991 | US4992998 Acoustic range finding system |
| 02/12/1991 | US4991436 Fuel tank gauge |
| 02/12/1991 | US4991435 Electronic fuel gauge system |
| 02/12/1991 | US4991434 Method and apparatus for determining whether a liquid in a reservoir is above a certain level |
| 02/12/1991 | US4991433 Phase track system for monitoring fluid material within a container |
| 02/07/1991 | WO1991001483A1 Sheathing and venting of resistance-tape level sensor |
| 02/06/1991 | EP0411802A2 A method and apparatus for detecting changes in the liquid level of a storage tank |
| 02/06/1991 | CN2070901U Sensor for measuring liquid level |
| 02/06/1991 | CN2070900U Tank gage for float quay steamboat |
| 02/05/1991 | US4989754 Toner level detection system |
| 02/05/1991 | US4989560 Automotive engine oil level surveillance system |
| 02/05/1991 | US4989452 Liquid-level detector |
| 01/31/1991 | DE4019290A1 Contactless sensing arrangement for media - has capacitance proximity switch with LF clock generator driving switch in supply line |
| 01/29/1991 | US4988978 Liquid level indicator for storage tanks |
| 01/29/1991 | US4988975 Dip stick resistive liquid level detector with adjustable stop |
| 01/29/1991 | US4987914 Mass flowmeter apparatus |
| 01/29/1991 | US4987777 Liquid level sight gauge |
| 01/29/1991 | US4987776 Level indicator |
| 01/29/1991 | US4987775 Propellant measurement system |
| 01/29/1991 | CA1279721C Ultrasonic apparatus for determining the amount of liquid in a container of known volume |
| 01/29/1991 | CA1279540C Portable gas grill |
| 01/27/1991 | CA2004775A1 Master cylinder |
| 01/24/1991 | WO1991000765A1 Apparatus for sensing the presence of a conductive liquid in a non-conductive liquid |
| 01/24/1991 | DE3923079A1 Measuring level of electrically conducting liquid - has measuring of infusion liquid or blood from change in capacitance of electrodes in measurement liquid |
| 01/23/1991 | EP0409732A1 Detector for the presence of a liquid using a composite elastic wave guide |
| 01/23/1991 | EP0409458A1 Ultrasonic fluid level sensor |
| 01/23/1991 | EP0409349A1 Apparatus for controlling the level in a beverage dispensing system |
| 01/23/1991 | EP0387287A4 Thermoplastic melting apparatus with a level indicator |
| 01/22/1991 | US4987409 Level sensor and alarm |
| 01/22/1991 | US4987400 Magnetically driven variable resistor gauge |
| 01/22/1991 | US4986124 Screened inductance sensors, especially sensors for level measurement |
| 01/15/1991 | US4985696 Electronic controller by resistivity of water-oil interface |
| 01/15/1991 | US4984462 Detachable liquid level monitoring apparatus and method |
| 01/15/1991 | US4984457 Tank gauging apparatus and method |
| 01/15/1991 | US4984449 Ultrasonic liquid level monitoring system |
| 01/11/1991 | CA2010864A1 Down-hole liquid detecting apparatus |
| 01/10/1991 | DE3926218A1 Level measurement arrangement esp. for multiple phase mixtures - has rod sensor with individual electrodes over rod length connected to evaluation device |
| 01/10/1991 | DE3920723A1 Profiled sensor e.g. for liq. level monitoring - has zones generating signal when in common contact with conducting medium |
| 01/09/1991 | EP0407283A1 Liquid accumulator under high pressure with regulated liquid level |
| 01/09/1991 | CN2069107U Float-level indicator having photoelectric encording strip |
| 01/09/1991 | CN2069106U Oil consume sensor |
| 01/09/1991 | CN2069105U Integralization cable for measuring level of materials |
| 01/09/1991 | CN2069104U Digit model level measuring apparatus by measuring osmotic pressure |
| 01/08/1991 | US4983964 System for data transmission |
| 01/08/1991 | US4983855 Liquid level gauge for tanks |
| 01/08/1991 | US4982655 Saucepan capable of setting amount of soup finally left therein |
| 01/08/1991 | US4982606 Fluid level sensor and controller |
| 01/03/1991 | DE4018646A1 Automatic level measurement device for vehicle fuel tank - has preferred breakage weak point preventing connecting flange fracture for any load direction |
| 01/03/1991 | DE3921331A1 Liquid level sensor e.g. for vehicle fuel tanks - has optical conductor deflected according to float height by deflection part shaped according to container characteristics |
| 01/02/1991 | EP0405835A2 Two wire coolant level sensor |
| 01/02/1991 | EP0405414A2 Apparatus for warning abnormality of engine |
| 01/02/1991 | EP0404919A1 Liquid level gauge |
| 01/02/1991 | CN2068674U Ligh-gathering bicolour fluviograph |
| 01/02/1991 | CN1011065B Protecting device for compressor |
| 01/01/1991 | US4981040 Sight flow indication apparatus with multi-sealing protective arrangements |
| 01/01/1991 | US4981039 Liquid level gauge |
| 01/01/1991 | US4981016 Master cylinder dip stick |
| 12/27/1990 | WO1990015970A1 Automated flow rotameter |
| 12/27/1990 | EP0404479A1 Device for measuring displacement |
| 12/26/1990 | CN2068230U Tubular capacitance sensor |
| 12/26/1990 | CN2068229U Water level, pressure display control instrument |
| 12/25/1990 | US4979797 Multi-level fiber-optic liquid-level sensing system |
| 12/25/1990 | US4979545 Bubbler container automatic refill system |
| 12/19/1990 | EP0403391A1 Device for measuring the fuel level in a tank of an automobile vehicle |
| 12/19/1990 | EP0403283A1 Displacement servo gauge |
| 12/19/1990 | CN2067824U Optical grating type measurer for liquid level in storage tank |
| 12/18/1990 | US4977850 Signal apparatus |
| 12/18/1990 | US4977786 Capacitive liquid level sensor |
| 12/16/1990 | CA2018806A1 Displacement servo gauge |
| 12/13/1990 | WO1990015333A1 Apparatus and method for the self-levelling of liquid in a container |
| 12/12/1990 | EP0402331A1 Device for a level sensor for household appliances |
| 12/12/1990 | CN2067402U Contactless bichromatic liquid level gauge |
| 12/12/1990 | CN2067401U Digital liquid level gauge |
| 12/12/1990 | CN2067400U Float code band liquid level gauge |
| 12/11/1990 | US4977528 Apparatus and method for determining the amount of material in a tank |
| 12/11/1990 | US4977413 Ink remain detector having a flexible member and a liquid injection recording apparatus utilizing the detector |
| 12/11/1990 | US4977385 Distributed RTD |
| 12/11/1990 | US4976146 Liquid level measuring apparatus |
| 12/11/1990 | US4975998 Fluid level measuring stick cleaning device (dip-squeeze) |
| 12/11/1990 | CA1277508C Method and device for detecting liquid level |
| 12/06/1990 | DE3917497A1 Level sensor with permanent magnet - pivotally mounted about vertical axis w.r.t. magnetically-operated switch |
| 12/06/1990 | DE3917496A1 Level sensor with permanent magnet operating electrical switch - installed at lower end of vertical pipe sealed by non-magnetisable material against medium |
| 12/05/1990 | EP0401111A1 Liquid level and/or volume measuring device using a capacitive probe |
| 12/05/1990 | EP0400167A1 Level sensor with high signal amplitude for fluids, in particular for chemically aggressive fluids |
| 12/05/1990 | CN2066977U Float-type code band level meter |
| 12/04/1990 | US4974448 Electrodes for measuring the level of milk in flowmeters |
| 12/04/1990 | CA1277388C Liquid level sensor |
| 11/30/1990 | CA2005782A1 Apparatus and method for the self-levelling of liquid in a container and/or for the introduction of bubble-free liquid to a container |
| 11/29/1990 | WO1990014579A1 Adjustable liquid level indicator |
| 11/29/1990 | DE4010763A1 Measuring level and density in pressureless liq. container - immersing rise pipe to draw in liq. by vacuum or pressure and measuring time or pressure from movement |
| 11/28/1990 | EP0399967A2 Pneumatic device for level detection of a liquid and the control thereof |
| 11/28/1990 | EP0399824A2 An electrical liquid level sensor for an internal combustion engine |
| 11/28/1990 | EP0399686A1 An electrical resistance oil level sensor for an internal combustion engine |