| 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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| 03/31/1981 | US4258745 Control device for a liquid level maintaining system or the like |
| 03/31/1981 | US4258444 Bath water level control system |
| 03/25/1981 | EP0025525A2 Liquid-level measuring device |
| 03/24/1981 | US4258422 Liquid gaging system |
| 03/24/1981 | US4257748 Flow indicator for positive displacement pump |
| 03/18/1981 | EP0025389A2 Device for measuring the level of a liquid and/or the local density of a two-phase liquid-vapour mixture |
| 03/17/1981 | US4255975 Device for the precise measurement of movements or deformations |
| 03/17/1981 | US4255859 Drop-weight material level indicator |
| 03/11/1981 | EP0024589A2 Device for measuring length and temperature, in particular for tank installations or the like |
| 03/11/1981 | EP0024527A2 Arrangement for measuring the level of the bath in a casting plant, in particular in the mould of a continuous-casting plant |
| 03/10/1981 | US4255747 Sump pump level warning device |
| 03/03/1981 | US4254482 Echo location system which provides for measuring liquid level and flow rate and flow volume of flowing liquids |
| 03/03/1981 | CA1096958A1 Caustic detection system |
| 02/24/1981 | US4252017 Apparatus for monitoring fluid level in a vessel |
| 02/18/1981 | EP0023949A1 Potentiometer manufactured according to the thick-film technique |
| 02/17/1981 | US4251809 Method and apparatus for detecting the presence of water in oil |
| 02/17/1981 | US4250750 Liquid level measuring system |
| 02/17/1981 | CA1095740A1 Milk monitoring method and apparatus |
| 02/10/1981 | US4249598 Outdoor well depth indicator |
| 02/04/1981 | EP0023470A2 Dispenser for liquid soap |
| 02/03/1981 | US4248088 Float for use in tank gauging systems |
| 02/03/1981 | US4248087 System and method for determining fluid level in a container |
| 01/28/1981 | EP0023029A2 Apparatus for measuring evaporation and/or precipitation |
| 01/27/1981 | US4247784 Measurement of material level in vessels |
| 01/21/1981 | EP0022742A1 Dispersing vessel |
| 01/21/1981 | EP0022739A1 Process and apparatus for measuring the slag level in a metallurgical vessel and for assessing its physical condition |
| 01/21/1981 | EP0022448A1 Measuring device for an oil level with a solid-housing sheath and a retractable measuring stick |
| 01/20/1981 | US4246489 Liquid level detector for detecting a liquid level when reaching a prescribed height |
| 01/20/1981 | US4245505 Indicator of amount of liquefied gas in bottle |
| 01/20/1981 | US4245367 Dip stick wiper |
| 01/20/1981 | CA1094202A1 Digital logic for condition responsive sensor |
| 01/20/1981 | CA1094194A1 Conductive probe level control |
| 01/13/1981 | US4245188 Capacitive measuring transducer |
| 01/13/1981 | US4244385 Fluent material level control system |
| 01/13/1981 | US4244219 Liquid-level meter |
| 01/13/1981 | US4244218 Fluid measuring device |
| 01/13/1981 | US4244210 Combined fuel level and fuel consumption indicator |
| 01/07/1981 | EP0021022A2 Apparatus for watching lubricants in a motor vehicle |
| 01/06/1981 | CA1093180A1 Paddle for use in a rotating-paddle bin level indicator |
| 01/06/1981 | CA1093121A1 Reservoir with integrally formed window and method of making same |
| 01/06/1981 | CA1092855A1 Method and apparatus for measuring volume and density of fluids by a drilling fluid system |
| 12/30/1980 | US4242744 Fixing of sonic transducer to a container |
| 12/30/1980 | US4242590 Liquid level detector with hysteresis means |
| 12/30/1980 | US4241606 Particulate level measuring method and apparatus |
| 12/30/1980 | CA1092479A1 Apparatus and method for continuously monitoring and controlling the level of tar in a settling tank |
| 12/30/1980 | CA1092344A2 Tape assembly |
| 12/23/1980 | US4240747 Refractive-index responsive light-signal system |
| 12/23/1980 | US4240282 Combined level indicator and hydrometer |
| 12/10/1980 | EP0019816A1 Flexible, continuous filling level detector for electrically conductive liquids |
| 12/09/1980 | US4238844 Displaced position detecting device |
| 12/02/1980 | US4236314 Electromechanical filling-level measurement |
| 11/27/1980 | WO1980002592A1 Float for use in tank gauging systems |
| 11/26/1980 | EP0019540A1 Apparatus for measuring a liquid level |
| 11/25/1980 | US4236144 Inspection system for a group of tanks |
| 11/25/1980 | US4235829 Vapor delivery system and method of maintaining a constant level of liquid therein |
| 11/25/1980 | US4235423 Indication of levels in receptacles |
| 11/25/1980 | US4235186 Oil level indicator |
| 11/25/1980 | US4235106 System and method for obtaining compensated level measurements |
| 11/25/1980 | CA1090392A1 Automotive brake fluid low level warning sensor |
| 11/25/1980 | CA1090157A1 Hydrostatic head pressure monitor with remote readout |
| 11/18/1980 | US4233704 Oil dipstick cleaning device |
| 11/12/1980 | EP0018467A1 Device for the electrical measurement of the volume of liquid in a container |
| 11/04/1980 | US4232300 Level measuring system using admittance sensing |
| 11/04/1980 | US4231250 Apparatus for continuous measurement of the liquid level in a container |
| 10/29/1980 | EP0018185A1 Attitude compensating indicator |
| 10/28/1980 | US4231025 Level and temperature readout and alarm system |
| 10/28/1980 | US4229973 Device for braking float motion in float-type liquid level gauge |
| 10/28/1980 | US4229972 Methods of and/or means for indicating the levels of liquids |
| 10/28/1980 | CA1088647A1 Silo level indicating system |
| 10/21/1980 | US4229798 Liquid storage tank contents gauge |
| 10/15/1980 | EP0017453A1 Washing appliance and liquid level sensing means therefor |
| 10/15/1980 | EP0017308A1 Process and apparatus for metering, controlling and blending liquid flows |
| 10/15/1980 | EP0016929A1 Device for monitoring a supply of liquid lubricant in a motor vehicle |
| 10/14/1980 | US4227410 Attitude compensating indicator |
| 10/07/1980 | US4227236 Flexible body for use in liquid level indicating apparatus |
| 10/07/1980 | US4227190 Water alarm for monitoring floor moisture |
| 10/07/1980 | US4227171 Liquid level sensing means |
| 10/07/1980 | US4227057 Apparatus for ascertaining the upper level of liquids in tanks or the like |
| 10/07/1980 | US4226278 Automatic molten metal surface level control system for continuous casting machines |
| 10/07/1980 | US4226118 Level detector |
| 10/07/1980 | US4226023 Portable device for determining physical qualities of pressurized container contents |
| 10/07/1980 | CA1087274A1 Pulsed level sensor |
| 10/07/1980 | CA1087271A1 Detecting different fluids, such as oil at the surface of water |
| 10/07/1980 | CA1087269A1 Frequency sensitive level detecting apparatus |
| 10/07/1980 | CA1086938A1 Ullage measuring device |
| 10/01/1980 | EP0016511A1 Float operated electrical switch assembly |
| 09/23/1980 | US4224606 Fluid level detector test switch |
| 09/23/1980 | US4223552 Apparatus and method for sensing a substance on a liquid surface |
| 09/23/1980 | US4223442 Distance measurement |
| 09/23/1980 | CA1086402A1 Vertical float switch |
| 09/16/1980 | US4223231 Liquid level monitor apparatus |
| 09/16/1980 | US4222267 Material level detector circuit |
| 09/09/1980 | US4221632 Method and apparatus for determining the location of the chip level in a pulping digester |
| 09/02/1980 | US4221004 Adjustable ultrasonic level measurement device |
| 09/02/1980 | US4220048 Cooler and level indicator for beer kegs |
| 09/02/1980 | US4220047 Fuel tank gauge |
| 08/26/1980 | US4219133 Storage level monitor |
| 08/26/1980 | CA1084606A1 Apparatus for determining the liquid level in a tank |
| 08/20/1980 | EP0014352A1 Apparatus for measuring the storage level in reservoirs |
| 08/20/1980 | EP0014301A1 Level measurement device |