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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 8146420 | HTA fluid level and fluid type measurement Apparatus for measuring an amount of ablation fluid circulating in a system for ablating tissue comprises a plurality of electrical contacts located within an ablation fluid receiving chamber of the system, the contacts being located at various heights and a data pr... | 04/03/2012 |
| 8127604 | Liquid level sensor for galley inserts The liquid level sensing device includes rotating electrically conductive probes and uses a self-cleaning rotary electrical connection system with a contact stylus on a rotating conductive barrel, for sensing a liquid level in a dispensing container of an aircraft g... | 03/06/2012 |
| 8074514 | Liquid level sensor with conductive torsion springs An assembly with liquid level sensor probes which rotate down into a container by means of torsion springs, thereby eliminating failure to the springs due to bending. The torsion springs also act as conductors in an electric circuit without any electrical slip joint... | 12/13/2011 |
| 8065913 | Ink level sensor A probe assembly for use with an ink reservoir level sensing apparatus comprises an insulating support frame formed of an electrically insulating material. The insulating support frame includes a lower portion to be positioned in a lower portion of an ink reservoir ... | 11/29/2011 |
| 8043768 | Liquid tank using fuel cell system and liquid level detection device A liquid tank capable of detecting liquid level when the tank is rotated. The liquid tank includes an airtight vessel to store the liquid; and at least two electrodes installed inside the airtight vessel. The distal ends of the electrodes are positioned at a central... | 10/25/2011 |
| 8024969 | Liquid level detection device A liquid level detection device includes a sensor provided in a container which stores a liquid therein and having a variable resistance which changes a resistance value in association with a change of liquid level to output a voltage signal according to the resista... | 09/27/2011 |
| 7971481 | Circuit design to prevent false level sense readings A circuit for conveying signals between one or more ink level sensors and a circuit includes a substrate having a circuit end, a sensor end, and an elongated body extending therebetween. The sensor end includes a bottom layer in which the first signal trace is route... | 07/05/2011 |
| 7905144 | Measuring device, and conductivity measuring device, for determining flow capacities of electroconductive liquids, measuring element, and method A measuring device for determining flow capacities d(V(z)) of electroconductive liquids having a conductivity LF through a container in the event of vertically (z direction) variable levels. The inventive measuring device is a conductivity measuring device comprisin... | 03/15/2011 |
| 7891242 | Sensing device The present invention discloses a sensing device, wherein a hemispherical container containing a liquid dielectric, and the hemispherical container has more than two pairs of electrodes, and the liquid dielectric can trigger the conduction states of the electrodes. ... | 02/22/2011 |
| 7823447 | Method and apparatus for sensing a liquid level Aspects of the invention are directed to methods and apparatus for dispensing liquids to and aspirating liquids from a container. In particular, one aspect is directed to a liquid level sensing system that includes a probe constructed and arranged to be moved relati... | 11/02/2010 |
| 7730780 | Level switch and method for detecting the fill level of a medium in a container A level switch detects the fill level of a medium in a container and transmits a switch signal corresponding to the detected level. The level switch incorporates a signal generator for generating an electromagnetic signal, a measuring circuit, and a reference circui... | 06/08/2010 |
| 7665358 | Self-calibrating liquid level transmitter The present disclosure generally relates to a capacitance sensing apparatus equipped with self-calibrating capacity and method of use thereof. The disclosure contemplates the determination using a secondary means of precise fluid levels according to five possible em... | 02/23/2010 |
| 7661307 | Low manufacturing cost printed ink liquid level sensors First and second elongated flexible insulated substrates have patterns of resistive liquid level sensor sections along the substrate lengths, each pattern comprising printable resistive ink of the same resistivity (ohms-squared), wherein the patterns can be simultan... | 02/16/2010 |
| 7621181 | Fluid level detector and analyzer An electronic technique is used for identifying a fluid and determining its level in a container. Specifically, impedance spectroscopy is applied to fluid handling probes such as those employed by automated chemical and immunoassay analyzers to provide superior sens... | 11/24/2009 |
| 7610804 | Electro-optic liquid level sensing system for aircraft beverage brewing The electro-optic liquid level sensing system detects a level of liquid in a container having an upper opening, such as for a server container of a beverage maker for a transport system, such as for aircraft, trains, trucks, buses and the like. A support housing mat... | 11/03/2009 |
| 7568389 | Liquid detecting apparatus, liquid-amount detecting apparatus, liquid detecting method, and liquid-amount detecting method A liquid-amount detecting apparatus detects the amount of a liquid in containers. The liquid-amount detecting apparatus includes a liquid detecting circuit and a determining unit. The liquid detecting circuit includes electrode units disposed so as to be in contact ... | 08/04/2009 |
| 7490513 | Method for sensing levels of conductive liquids A liquid level sensor comprises a plurality of electrodes arranged in a defined relationship with respect to a container filling trajectory, a signal generator coupled to one or more of the plurality of electrodes, a signal receiver coupled to one or more of the plu... | 02/17/2009 |
| 7487677 | Apparatus and methods for monitoring water consumption and filter usage Apparatus and methods for employing electrical properties of water to indicate the level of filtered water in a filtered water container. The container is fitted with a hopper that holds unfiltered water. The hopper is fitted at its base with a removable and replace... | 02/10/2009 |
| 7467548 | Radar level gauge system and coupling A radar level gauge system for measuring a filling level of a content contained in a tank is disclosed. The system comprises a transmitter and a probe, configured to guide transmitted microwave energy towards the content. Further, it comprises a coupling comprising ... | 12/23/2008 |
| 7461550 | Self-calibrating liquid level transmitter The present disclosure generally relates to a capacitance sensing apparatus equipped with self-calibrating capacity and method of use thereof. The disclosure contemplates the determination using a secondary means of precise fluid levels according to five possible em... | 12/09/2008 |
| 7441455 | Apparatus for measuring and indicating the level and/or volume of a liquid stored in a container The present invention refers to an apparatus for measuring the level and/or volume of a liquid stored in a container. The apparatus comprises at least one pair of electrodes mounted in the interior of the container in such a position that said electrodes are partial... | 10/28/2008 |
| 7423436 | Capacitive level measurement and detection device using high frequency voltage A device for measurement and detection of the level of a medium in a container with a sensor element, with a reference element and an electrical circuit which contains at least one AC voltage source and an evaluation unit, the sensor element and the reference elemen... | 09/09/2008 |
| 7406865 | Level measurement arrangement A level measurement arrangement for measurement of a level of a product in a container comprising: a level sensor, comprising: a conductive probe, a mounting element, comprising, and a process connector, for mounting the mounting element on a ferrule on the containe... | 08/05/2008 |
| 7392700 | Method and system for determining fuel level A method and system for determining the level of fuel contained in the tank of a motor vehicle includes a first resistive element disposed in the tank and having a first predetermined length. The first resistive element generates a variable resistance in response to... | 07/01/2008 |
| 7392699 | Apparatus for use in measuring fluid levels A device for use in measuring stratified fluid levels in a container is disclosed. The device has a microwave transceiver sensor head attached to a waveguide sensor rod which is enclosed by a gauge tube. The rod end tubes are comprised of sections which allow them t... | 07/01/2008 |
| 7378857 | Methods and apparatuses for detecting the level of a liquid in a container A method for detecting the level of a liquid in a container. The method includes applying a predetermined voltage to a level measuring electrode, disposed within the container, for a predetermined first period of time; then, discontinuing the application of the volt... | 05/27/2008 |
| 7373818 | Fixing system for a measuring device for monitoring and/or determination of a filling level A securement system for a measuring device for monitoring and/or determining a fill level of a medium in a container, with at least one device housing and at least one elongated unit. In the device housing, at least one cutting ring is provided, which cuts into the ... | 05/20/2008 |
| 7367231 | Flexible guided wave level meter probe The invention is a level meter having a flexible probe. The flexible probe includes a flexible conductor and at least one flexible band shield member disposed in a substantially vertically parallel relationship with the conductor, where the conductor and the shield ... | 05/06/2008 |
| 7369055 | Water softener monitoring system A system for monitoring the level or amount of a material within a container is provided. The system includes a detection mechanism that can be a direct detection mechanism or any of a number of indirect detection mechanisms. When the detection mechanism senses an u... | 05/06/2008 |
| 7360418 | Method and apparatus for sensing liquid level using baseline characteristic A liquid level sensing arrangement using a probe uses a baseline probe circuit characteristic, e.g., a circuit resistance or voltage, that is measured when the probe is out of contact with the liquid in the tank. The baseline characteristic may be used to determine ... | 04/22/2008 |
| 7343798 | Method, apparatus, hardware, and computer program product for a liquid level sensor A method, apparatus, hardware, and computer program product for measuring a parameter related to the height of a liquid in a measurement vessel. An alternating voltage is applied to an input rod positioned in a reference vessel containing the liquid at a known heigh... | 03/18/2008 |
| 7334471 | Liquid sensor and ice detector An improved apparatus and a method of measuring and interpreting reliably, simply and accurately the information on continuous liquid level, liquid temperature and other liquid properties within a vessel. The apparatus is suited for economical manufacturing and coul... | 02/26/2008 |
| 7318345 | Method of measuring the height of a liquid using a high-frequency line probe The invention relates to a method of measuring the height of a liquid using a high-frequency line probe. According to the invention, a comparison is made, on an electric circuit (3) which is supplied with high-frequency alternating current, between the impeda... | 01/15/2008 |
| 7319336 | Charged particle beam device probe operation An apparatus including a positioner control device, a measuring device and a control routine. The positioner control device is communicatively coupled to a chamber of a charged particle beam device (CPBD) and is configured to individually manipulate each of a plural... | 01/15/2008 |
| 7318344 | Wireless swimming pool water level system A wireless (e.g., radio) system and method for automatic water level maintenance of, e.g., a swimming pool utilizing capacitive liquid level sensing. A reference electrode allows water level sensing independent of the water chemistry or temperature. Capacitive elect... | 01/15/2008 |
| 7313944 | Method and apparatus for leak testing closed containers Leak testing a closed container with at least one flexible wall area is performed with the method and apparatus wherein a biasing arrangement compresses or expands the container under test. A biasing force is monitored with a force detector applicable to the wall of... | 01/01/2008 |
| 7307582 | Method for determining a level of material with a two-wire radar sensor comprising intermittently operating circuitry components and a two-wire radar sensor A method for determining a distance between a radar sensor and a reflection surface of a material comprising the following steps. The radar sensor is energized via a two-wire control loop which allows for data communication and an internal energy store. An echo prof... | 12/11/2007 |
| 7304583 | Device for detecting a defined filling level of a medium in a container An apparatus for detecting a predefined fill level of a medium in a container having a lid by means of a conductive measuring system, which has at least two measuring electrodes extending into the container. A measurement current flowing between the two measuring el... | 12/04/2007 |
| 7293458 | Electro-optic liquid level sensing system for aircraft beverage brewing The electro-optic liquid level sensing system detects a level of liquid in a container having an upper opening, such as for a server container of a beverage maker for a transport system, such as for aircraft, trains, trucks, buses and the like. A support housing mat... | 11/13/2007 |
| 7294277 | Method of determination of the conditions of exhaustion of a filtering cartridge for filtering carafes with replaceable cartridge and carafe operating in compliance with such method A method of determination of the conditions of exhaustion of a filtering cartridge for filtering carafes with replaceable cartridges is described, in which an initial identification of impedance of the water to be filtered is provided for in order to consequently ca... | 11/13/2007 |
