| 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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| 08/22/1991 | DE4004939A1 Well level measurement arrangement - has head station at top of well pipe connected to level sensor via cable |
| 08/21/1991 | EP0441999A1 Installation to monitor water level in a boiler |
| 08/21/1991 | EP0321485A4 Distance and temperature measuring system for remote locations |
| 08/14/1991 | EP0441050A2 Method for sensing temperature, pressure and liquid level, and variable ratio fiber optic coupler sensors therefor |
| 08/14/1991 | DE4003146A1 Collapsible bottle for liquid nourishment to feed patient |
| 08/14/1991 | CN2082851U Double-color liquid level gage with simple optical path structure |
| 08/13/1991 | US5038840 Bubbler container automatic refill system |
| 08/13/1991 | US5038611 Apparatus and method for providing a temperature compensated liquid level measurement |
| 08/08/1991 | DE4003048A1 Diaphragm force or pressure transducer |
| 08/07/1991 | EP0440011A2 Force and/or measuring device |
| 08/07/1991 | EP0439790A2 Pressure sensor for hydrostatic filling level measurement |
| 08/07/1991 | CN2082404U Balance type lower-limit change level indicator |
| 08/07/1991 | CN1053689A Multifunctional remote level controller |
| 08/06/1991 | US5036892 Automatic control system for filling beverage containers |
| 08/06/1991 | US5036703 Method and apparatus for testing liquid fillings in tanks |
| 08/06/1991 | US5036661 Regulated level accumulator for liquid under high pressure |
| 08/06/1991 | CA1287232C Optical fluid level indicator |
| 08/03/1991 | CA2035133A1 Force or pressure measuring device |
| 07/31/1991 | EP0438864A1 Cryogenic liquid level sensing apparatus |
| 07/31/1991 | CN2081974U Triple prism type dichromatic tank gage |
| 07/31/1991 | CN1013404B Cable object level gage |
| 07/30/1991 | US5035512 Oil-level sensing apparatus having a time delay function |
| 07/30/1991 | US5035141 Apparatus for measuring small changes in liquid level in a container |
| 07/30/1991 | US5035140 Self cleaning liquid level detector |
| 07/30/1991 | CA1287144C Apparatus for detecting slag flowing along in a stream of a metal melt |
| 07/24/1991 | EP0438159A1 Capacitive liquid interface sensor |
| 07/24/1991 | EP0438158A1 Capacitive liquid level sensor |
| 07/24/1991 | EP0438136A2 Automated dispensing and diluting system |
| 07/24/1991 | EP0437872A2 Method and system for measurement of fluid flow in a drilling rig return line |
| 07/24/1991 | CN2081527U Boiler water-level display device |
| 07/23/1991 | US5033300 Device for measuring displacement |
| 07/19/1991 | CA2034549A1 Capacitive liquid level sensor |
| 07/19/1991 | CA2034548A1 Capacitive liquid interface sensor |
| 07/19/1991 | CA2034257A1 Automated dispensing and diluting system |
| 07/18/1991 | DE4036042A1 Amt. of detector for objects in vol. - has photoreceptor detecting light passed through passing objects e.g. grain, saw dust, wood chips |
| 07/17/1991 | CN2081084U Float fluviograph |
| 07/17/1991 | CN2081083U Transmitting and reflecting type bicolor level gauge |
| 07/17/1991 | CN1053125A Measuring unit for liquid specific gravity and level |
| 07/17/1991 | CN1053124A Physical parameter collector for slurry |
| 07/16/1991 | US5033011 Apparatus and method of controlling a refuse disposal crane |
| 07/16/1991 | US5032812 Solenoid actuator having a magnetic flux sensor |
| 07/16/1991 | US5031453 System and method of error reduction for differential capacitive transducers |
| 07/16/1991 | US5031452 Water level probe |
| 07/16/1991 | US5031451 Fluid level monitor |
| 07/16/1991 | US5031405 Hydraulic reservoir of master cyclinder |
| 07/13/1991 | CA2046911A1 Method and apparatus for detecting liquid leaks |
| 07/11/1991 | WO1991010116A1 A method and a device for determining the positions of boundary layers |
| 07/10/1991 | EP0436207A1 Method of detecting a level of liquid in a moving cylindrical body |
| 07/09/1991 | US5031126 Constant power thermal sensor |
| 07/09/1991 | US5031068 Liquid level control system for refrigeration apparatus |
| 07/09/1991 | US5029472 Measuring instrument, preferably for watercraft |
| 07/09/1991 | US5029471 Liquid level sensor assembly |
| 07/05/1991 | CA2007245A1 Sewer monitor |
| 07/04/1991 | DE4000037A1 Float with adjustable pneumatic feeder in multilayer liq. - provides data on layer thicknesses |
| 07/04/1991 | DE3942239A1 Level sounding system for material forming phase boundary in container - measures length of cable deployed to lower probe into container |
| 07/03/1991 | EP0435488A1 Apparatus and method for providing a temperature compensated liquid level measurement |
| 07/03/1991 | EP0435401A1 Parameter measuring circuit |
| 07/03/1991 | EP0434705A1 Device for measuring activity and volume of radioactive liquids. |
| 07/03/1991 | CN2080167U Pressure balance sensor for liquid level |
| 07/03/1991 | CN1013063B Optical part comprising optical fiber and light element or receiving element and method for making same |
| 07/02/1991 | US5029268 Circuit arrangement for self-excitation of a mechanical oscillation system to natural resonant oscillations |
| 07/02/1991 | US5028910 Drain overflow alarm |
| 07/02/1991 | US5027656 Fuel gauge damper circuit with a return to zero gauge circuit |
| 07/02/1991 | US5027655 Method and apparatus for measuring liquid level in the ground |
| 06/27/1991 | CA2028670A1 Cryogenic liquid level sensing apparatus |
| 06/26/1991 | EP0434509A1 Liquid propergol supply system for space vehicle capable of predicting its exhaustion |
| 06/26/1991 | EP0433995A2 Remote instrument testing system |
| 06/25/1991 | US5027075 Apparatus for determination of probe contact with a liquid surface |
| 06/25/1991 | US5026993 Apparatus for monitoring settlement of a solid in a liquid, and a system incorporating same |
| 06/25/1991 | US5026984 Methods for sensing temperature, pressure and liquid level and variable ratio fiber optic coupler sensors therefor |
| 06/25/1991 | US5025764 Lubricant oil amount detector of a vertical shaft type engine |
| 06/25/1991 | US5025569 Dip stick guide, combination dip stick and dip stick holder |
| 06/23/1991 | CA2032589A1 Liquid propellant supply device for spacecraft adapted to predict the end of its service life |
| 06/20/1991 | DE4040718A1 Tall narrow liq. reservoir - has measurement rod and aperture of matching size but different shapes to prevent moisture reaching scale |
| 06/20/1991 | DE3941963A1 Liq. level indicator esp. vehicle diesel - has immersion unit with transfer tube to display achieving compromise between display damping and response |
| 06/20/1991 | DE3940082A1 Switching threshold adjuster for capacitive sensors - used for material detection involves using plastic model structure of dielectric constant and dimensions |
| 06/19/1991 | CN2079286U Capacitor type liquid level meter |
| 06/19/1991 | CN2079285U A type material positioning device |
| 06/19/1991 | CN2079284U 连续液位测量传感器 Continuous level measurement sensor |
| 06/18/1991 | US5024802 Method for steam generator water level measurement |
| 06/18/1991 | US5024086 Method of measurement of the level of the surface of a metal bath |
| 06/18/1991 | US5024084 Flow meter for liquid doctored through Fourdrinier fabric at wet end of Fourdrinier paper machine |
| 06/15/1991 | CA2032189A1 Method and system for measurement of fluid flow in a drilling rig return line |
| 06/13/1991 | WO1991008450A1 Liquid level and composition sensor and method |
| 06/13/1991 | WO1991008449A1 Liquid-level detector for cryogenic liquids |
| 06/13/1991 | DE3940636A1 Registering coolant quantity in heat or cold pump - using measuring float in fluid monitoring view chamber which changes in vol. according to temp. and pressure |
| 06/13/1991 | DE3936816A1 Cleaning system for oil-level dipstick - incorporates narrow slot lined with foam material |
| 06/12/1991 | EP0432128A1 Continuous casting mold arrangement |
| 06/12/1991 | CN2078869U Tank gage using filament wheel as floating body |
| 06/11/1991 | US5023806 Telecommunication system for remote LP gas inventory control |
| 06/11/1991 | US5023608 Fuel filler alarm for boats |
| 06/11/1991 | US5022495 Oil fill tube assembly |
| 06/11/1991 | US5022269 Resonance frequency position sensor |
| 06/11/1991 | US5022263 Thermal fuel level detector |
| 06/06/1991 | DE3939496A1 Liquid container with level measurement arrangement for water heater - has measurement tube with float whose position is detected electromagnetically or by light barrier |
| 06/06/1991 | DE3939450A1 Level measurement unit for motor vehicle fuel tank - measures stresses or strains at container attachment points or sprung container suspension |
| 06/05/1991 | EP0430690A2 Toner level detection system |
| 06/05/1991 | EP0430651A1 Level sensor |
| 06/05/1991 | EP0430111A2 Optical sensor |
| 06/05/1991 | EP0429795A1 Control device for the lowering motion of the suction tube of an automatic sample dispenser |