| 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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| 04/26/1977 | US4019387 Temperature compensated liquid level transmitter |
| 04/19/1977 | US4019072 Piezoelectric pressure sensor |
| 04/19/1977 | US4019067 Conductive probe level control |
| 04/19/1977 | US4017935 Dip stick cleaner |
| 04/12/1977 | US4016758 Thermal gauge probe |
| 04/05/1977 | US4015319 Method for manufacturing an ultrasonic transducer |
| 03/29/1977 | US4015128 Device for and method of controlling the level in appropriate containers of a liquid which will emit infra-red rays and, in particular, the level of molten metal |
| 03/29/1977 | US4014359 Sprinkler flow control systems |
| 03/29/1977 | US4014214 Liquid level indicator |
| 03/22/1977 | US4014015 Absolute digital position measurement system |
| 03/22/1977 | US4014010 Fluid-dispensing apparatus having level control and alarm means |
| 03/22/1977 | US4013194 Device for metering by weight the delivery of liquids |
| 03/08/1977 | US4011553 Remote detector to indicate leakage of liquids in toilet tanks |
| 03/08/1977 | US4010650 Apparatus for generating an electrical signal indicative of liquid level |
| 03/08/1977 | US4010512 Self-contained receptacle type dip stick cleaner |
| 02/22/1977 | US4008613 Vibratory bin level indicators |
| 02/22/1977 | US4008612 Liquid quantity detecting device |
| 02/15/1977 | US4007636 Liquid metal level indicator |
| 02/08/1977 | US4006762 Fuel tank level detector and shut-off valve |
| 02/08/1977 | US4006637 Electro-mechanical displacement transducer |
| 02/08/1977 | US4006636 Method and apparatus for exact measurement of pressures by means of level or pressure measuring equipment of the bubble tube type |
| 02/08/1977 | US4006635 Liquid level measuring process and indicator |
| 02/01/1977 | US4006473 Irrigation signal |
| 01/25/1977 | US4004714 Dry developing mechanism |
| 01/18/1977 | US4003259 Method and a device for capacitive level measurement |
| 01/18/1977 | US4003258 Apparatus for detecting the level of a particulate material |
| 01/11/1977 | US4003038 Thermal discriminator for sensing variations in the heat exchange properties of a medium |
| 01/11/1977 | US4002996 Level detector using oscillator circuit with two capacitive probes |
| 01/11/1977 | US4002448 Method and apparatus for determining the elevation of the fusion interface in an electric glass melting furnace |
| 01/11/1977 | US4002215 Portable weigh apparatus for measuring liquid volume |
| 01/11/1977 | US4002068 Level-sensitive system |
| 01/04/1977 | US4001802 Solid state thermistor switch |
| 01/04/1977 | US4001676 Solid-state threshold detector |
| 01/04/1977 | US4000651 Liquid level indicator |
| 01/04/1977 | US4000650 Method and apparatus for ultrasonic material level measurement |
| 12/28/1976 | US3999435 Differential pressure transmitter |
| 12/21/1976 | US3999148 Oscillator circuit |
| 12/14/1976 | US3997744 Liquid level detector |
| 12/14/1976 | US3996801 Liquid metal level sensor with increased sensitivity |
| 12/07/1976 | US3996579 Battery electrolyte level indicator |
| 12/07/1976 | US3995914 Rod and guide assembly |
| 12/07/1976 | US3995488 Dielectric change sensing device |
| 11/30/1976 | US3995212 Apparatus and method for sensing a liquid with a single wire transmission line |
| 11/30/1976 | US3995169 Optical liquid level gauge |
| 11/30/1976 | US3995168 Electro optical fluid measurement system |
| 11/30/1976 | US3995167 Fiberoptic fluid level sensing mechanism |
| 11/30/1976 | US3994175 Device for detecting specific gravity and level of liquid |
| 11/30/1976 | US3994169 Material depth measurement and indicator |
| 11/23/1976 | US3993947 Admittance measuring system for monitoring the condition of materials |
| 11/23/1976 | US3992941 Liquid level measuring apparatus |
| 11/16/1976 | US3992706 Liquid level monitoring apparatus |
| 11/16/1976 | US3991476 Dip stick with sealing sleeve |
| 11/09/1976 | US3990307 Liquid level measuring and indicating apparatus |
| 11/09/1976 | US3990304 Fluid interface measuring device for use in earth boreholes |
| 10/26/1976 | US3988668 Antistatic capacitance probe |
| 10/26/1976 | US3987675 Pneumatic level sensing |
| 10/19/1976 | US3987236 Arrangement on electric induction furnaces for the determination of the filling level of the liquid melting material |
| 10/19/1976 | US3986663 Centrifugal separator with sensing means |
| 10/19/1976 | US3986399 Filled-in-fluid and diaphragm type intermediate device for transmitting pressure |
| 10/19/1976 | US3986398 Liquid level indicator |
| 10/12/1976 | US3986110 Water depth measuring device |
| 10/12/1976 | US3985030 Ultrasonic acoustic pulse echo ranging system |
| 10/05/1976 | US3983752 Remote-reading oil level gauge |
| 10/05/1976 | US3983751 Method of measuring the level of elevated temperature particulate material |
| 10/05/1976 | US3983750 Fluid level sensing device |
| 09/28/1976 | US3983549 Digitally-operated displacement detecting system |
| 09/21/1976 | US3982087 Liquid-level indicating means |
| 09/21/1976 | US3981195 Silo level measuring system |
| 09/14/1976 | US3980979 Magnetically operated switch unit |
| 09/14/1976 | US3979958 Apparatus for determining interface levels in ground cavities or containers containing liquid or gel-like material |
| 09/07/1976 | US3979022 Monitoring device |
| 08/31/1976 | US3978464 Means for sensing change in the amount of fluent material in a reservoir |
| 08/31/1976 | US3978463 Oscillator energized liquid level indicator |
| 08/31/1976 | US3978299 Liquid-level detecting device |
| 08/31/1976 | US3977908 Indicator in use with a lead storage battery for indicating the overdischarge of the same and the lowered level of the electrolyte therein |
| 08/31/1976 | US3977251 Sight glass assembly |
| 08/24/1976 | US3976963 Transducer for a path tracer |
| 08/24/1976 | US3976121 Detection apparatus |
| 08/24/1976 | US3975958 Apparatus for level measurement of free flowing substances, solid substances or combination of these in tanks, containers, reservoir or the like |
| 08/17/1976 | US3975633 Analog to digital encoder unit employing a pre-encoded film |
| 08/17/1976 | US3975605 Particulate material supply detectors |
| 08/17/1976 | US3975582 Fluid level sensing probe |
| 08/17/1976 | US3974825 Remote electrical monitoring of gas activated blood pumps |
| 08/17/1976 | US3974695 Double level gauge |
| 08/10/1976 | US3973437 System for metering liquid |
| 08/03/1976 | US3972235 System for determining the amount of liquid in a tank or series of tanks |
| 08/03/1976 | US3972234 Liquid level indicator |
| 07/27/1976 | US3971254 Solids level indicator |
| 07/20/1976 | US3969942 Liquid level responsive apparatus |
| 07/20/1976 | US3969941 Level detector for liquids and other flowable masses |
| 07/13/1976 | US3968688 Liquid level gauge |
| 07/13/1976 | US3968687 Battery electrolyte indicator device |
| 07/06/1976 | US3967549 Ink supply system for an ink mist printer |
| 07/06/1976 | US3967501 Slag level detection system |
| 06/29/1976 | US3967238 Low-brake fluid sensor |
| 06/29/1976 | US3965983 Sonic fluid level control apparatus |
| 06/22/1976 | US3965317 Apparatus for indicating cylinder fluid level |
| 06/22/1976 | US3964567 Low coolant level protection system |
| 06/22/1976 | US3964312 Magnetically actuated fluid-level indicator |
| 06/22/1976 | US3964311 Measuring apparatus |