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"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 7471208 | Process for continuously monitoring a fluid storage system using synchronized sensors A process for monitoring a fluid storage system using a vessel for storing the fluid and a detection apparatus using synchronized sensors for monitoring and measuring state properties of the fluid is disclosed. The method includes using a housing with at least one p... | 12/30/2008 |
| 7405667 | Apparatus for determining type of liquid in a container and method for controlling the apparatus A technique for quickly determining the type of liquid in a container externally regardless of the material of the container, preferably contactlessly. A halogen heater 102 and an infrared thermopile 103 are disposed outside an electrically conductive ... | 07/29/2008 |
| 7246662 | Systems and methods for controlling flow control devices A device for determining a location of an interface between a first fluid and second fluid includes a non-mechanical sensor that measures a selected parameter of interest relating to the fluid surrounding the sensor (“the surrounding fluid”) and a processor for ... | 07/24/2007 |
| 7233252 | Method and system of sewer scanning for water conservation Method of monitoring water conservation in an apartment complex by positioning infrared cameras with motion sensors in the clean outs of the waste water discharge lines leading to public sewer systems wherein each camera image is displayed on a computer screen and t... | 06/19/2007 |
| 7181965 | Self-heated liquid level sensor A liquid level sensor comprising a thermistor probe and a power source connected to the thermistor probe to heat the thermistor probe. A cover encases the thermistor probe and includes openings allowing liquid to enter and exit an interior of the cover and contact t... | 02/27/2007 |
| 7176805 | System for controlling ignition sources when flammable gas is sensed Upon detection of a flammable gas condition, an intelligent thermostat regulates operation of appliances that have sources of ignition which could be the source of or may ignite the flammable gas. This hazardous condition is detected by a flammable gas detector and ... | 02/13/2007 |
| 7146854 | Methods and apparatus for media level measurement Representative embodiments provide for a media level measurement apparatus, including a sensor to provide an ambient temperature signal, a controller, and a source configured to provide an electrical current. Also included are a thermistor device configured to provi... | 12/12/2006 |
| 7043967 | Sensor device for monitoring the condition of a fluid and a method of using the same The present invention is a compact apparatus and method that provides an efficient manner for monitoring the condition and level of a functional fluid directly in operating equipment. A sensor device is provided that includes a plurality of liquid sensors and a plur... | 05/16/2006 |
| 7040161 | Parts washer with improved temperature and pump control A parts washer including a receptacle positioned on a reservoir for cleaning liquid having a drain opening and a module which engages a portion of the reservoir in the cleaning liquid for adjusting the temperature of the cleaning liquid and circulating the cleaning ... | 05/09/2006 |
| 7010394 | Intelligent environmental sensor for irrigation systems The invention provides a regulator system for regulating the operation of an irrigation system which is responsive to user programmed information. It has a control element for issuing watering control signals to an irrigation system, having at least one of (i) a dur... | 03/07/2006 |
| 7000468 | Electronic level gauge Disclosed is a fluid level gauge for sensing the level of fluid in a dispenser. The level gauge includes an inlet port communicating with the fluid and a check valve in communication with the inlet port. The check valve includes a membrane which allows air to pass. ... | 02/21/2006 |
| 6973828 | Liquid level sensor An improved liquid level sensor is disclosed which provides a reliable and simple device for accurately determining the level of a liquid within a vessel. The sensor utilizes a plurality of thermocouple junctions grouped in pairs with the pairs being spaced along a ... | 12/13/2005 |
| 6959599 | Level detector for storage tanks for fluids A level detector for storage tanks for fluids comprises a microprocessor, a network of resistive elements connected in series or parallel, and a plurality of conductive elements between them, connected across a power source. The resistive elements have a high temper... | 11/01/2005 |
| 6847291 | Apparatus for detection of water level and temperature in a bathing appliance An apparatus operable in a wet environment for detecting the presence or absence of water in a non-conductive vessel, by measuring changes in dielectric constant and detecting the temperature of water in same vessel. A conductive element coupled to a sensing and swi... | 01/25/2005 |
| 6741180 | Beverage dispensing URN with electronic display A dispensing urn assembly (10, 10′) with a hollow body (12) with an interior surface for containing beverage (14) and a manually operable faucet (16) for selectively dispensing beverage (14) from the bottom of hollow body with an... | 05/25/2004 |
| 6615658 | Method and apparatus for detecting the internal liquid level in a vessel A system for detecting the level of a liquid in a vessel, comprises a detector assembly including a thermally conductive substrate supported within the vessel. One or more heaters are mounted on the substrate within the vessel. One or more temperature sen... | 09/09/2003 |
| 6612169 | Apparatus for engine lubricant level detection The invention relates to an indicator system for fluid levels, including two or more optically and/or thermally conducting fibers, preferably suitable for indicating the fluid level of a lubricant in the case of piston internal combustion engines. In this... | 09/02/2003 |
| 6578415 | Limit-level sensor and method of determining the undershooting or overshooting of an intended level of liquid in a container A limit-level sensor for measuring level of a liquid has a resistance element which has an electric resistance which suddenly varies a transition temperature which lies above the maximum liquid temperature. The resistance element is first of all heated by... | 06/17/2003 |
| 6568263 | Liquid level detector and system A system for detecting the level of fluid in a fluid containing vessel. The system includes a device for applying energy to a selected location on the vessel. A sensor in proximity to the location detects the energy level at the location during first and ... | 05/27/2003 |
| 6559771 | Sensing and measuring circuit employing a positive-temperature-coefficient sensing device A sensing and measuring circuit, employing a positive-temperature-coefficient sensing device, for detecting the presence and approximately measuring the quantity or concentration of heat-absorptive substances such as water. May be used for sensing a ... | 05/06/2003 |
| 6549136 | Sensing and switching circuit employing a positive-temperature-coefficient sensing device A sensor and associated circuitry for sensing and reacting to the presence of a fluid or other material having heat capacity. A positive-temperature-coefficient device initiates a switching step when the amount of heat-capacity material reaches a certain ... | 04/15/2003 |
| 6535134 | Method for the generation of an electrical signal sensor device for executing the method and the use of the sensor device A method for generating an electrical signal and a sensor device (10) for executing the method. The signal is generated because of a change in a fluid-filled space. A sensor element (12) of the sensor device (10) detects the heat transfer over time betwee... | 03/18/2003 |
| 6411916 | Food safety control method and apparatus A method of tracking and monitoring the temperature of a food product from point of origin until it is removed from the display case by the consumer for immediate transport to the point of sale. As a plurality of food products are delivered to a store and... | 06/25/2002 |
| 6237411 | Limit-level sensor and method of determining the undershooting or overshooting of an intended level of liquid in a container A limit-level sensor for measuring level of a liquid has a resistance element which has an electric resistance which suddenly varies a transition temperature which lies above the maximum liquid temperature. The resistance element is first heated by electr... | 05/29/2001 |
| 6184793 | Method of testing aboveground fuel systems A method of testing an aboveground-type fuel storage tank includes steps of positioning at a test location an aboveground-type fuel storage tank that has been configured as it is intended to be in commercial use and at least partially filling the abovegro... | 02/06/2001 |
| 6037873 | Bathing basin monitoring system A bathing basin monitoring system is provided including a housing with a couple adapted for securing to a bathing basin. A speaker is mounted on the housing for emitting audio signals. Also included is a moisture/temperature sensor assembly having a moist... | 03/14/2000 |
| 6005481 | Remaining fuel alarm for vehicular fuel-combustion heater Disclosed is a remaining fuel alarm for a vehicular fuel-combustion heater, comprising a thermistor for detecting whether or not a predetermined amount of fuel is stored in a fuel tank, a remaining fuel alarm lamp for displaying the fact that a remaining ... | 12/21/1999 |
| 5973605 | Thermistor monitor system A combination of circuits is responsive to a respective one of a definite number of operation patterns of a plurality of PTCs, the operation patterns being different therebetween and including a plurality of first patterns each respectively representative... | 10/26/1999 |
| 5942980 | Multi-sensor hydrostatic gauge for fuel storage tanks A probe rod is provided with sensor housings, pipe sections, and joint sleeves all having a common outer diameter. The sensor housings and joint sleeves are threadably connected to the various pipe sections. The threadable connections have a double seal u... | 08/24/1999 |
| 5923257 | Carafe with thermal sensor and digital display A method of displaying the temperature of the coffee in a carafe's bowl is accomplished by fastening a thermistor to the metal band supporting the bowl and with proper circuit board components displaying that temprature on a digital display on the carafe'... | 07/13/1999 |
| 5834943 | Apparatus and method for sensing failed temperature responsive sensors A microprocessor control (10, 24) has one or more temperature responsive thermistor sensors (20, 26, 28) used to provide temperature inputs to control operation of a temperature control system. The microprocessor control subjects the thermistor sensors to... | 11/10/1998 |
| 5821864 | Wireless interface probe apparatus and method A wireless interface probe having a transmitter, a signal transport/measuring device, and a receiver as provided. The transmitter has two sensors: a liquid level sensor and a water level sensor. The liquid level sensor determines the boundary between gase... | 10/13/1998 |
| 5812060 | Automated waste cooking grease recycling tank An automated waste cooking grease recycling tank having a top, a bottom, at least one side wall defining an inside and an outside of the tank with a plurality of openings in the tank. A liquid level sensor is inserted into the inside of the tank through o... | 09/22/1998 |
| 5798698 | Method of monitoring the level of a liquid in a container In cases of application where the critical temperature occurs or could occur, safe monitoring of the level of the liquid was not possible heretofore because the physical properties of the liquid and of the gaseous medium present above the latter in the co... | 08/25/1998 |
| 5778695 | Liquid level sensor using refrigrant subcooling A fluid level sensor. The sensor comprises a housing; a chamber enclosed by the housing; a liquid port in a lower area of the housing operable to connect the chamber to a lower, liquid containing area of a heat exchanger; and a gas port located in an uppe... | 07/14/1998 |
| 5729990 | Refrigeration system A refrigeration system having at least one defrostable cold-production device is disclosed, beneath which device a drip tray provided with a drain channel is arranged. In such a refrigeration system, it is desirable to reduce the risk of flooding because ... | 03/24/1998 |
| 5719332 | Process and system for operating a level sensor A process and a system for operating a level sensor, particularly for measuring amounts of liquid in motor vehicles, employs a plurality of heatable thermistors wherein a number of the thermistors are covered by liquid depending on the level of the liquid... | 02/17/1998 |
| 5713030 | Thermal management device and method for a computer processor A thermal management device for controlling the temperature of a computer processor chip, by controlling the operating speed of the processor, including a temperature sensitive circuitry incorporated within a packaged clock chip for connection to a proces... | 01/27/1998 |
| 5589823 | Remote status indicator for holding tanks containing no moving parts A transistor and integrated circuit-free remotely indicating status device for holding tanks for recreational vehicles and pleasure boats contains no moving parts, is resistant to corrosion, and is inexpensively and simply manufactured and installed. In o... | 12/31/1996 |
| 5434555 | Thermal dispersion switch with self test circuit A thermal dispersion flow/level switch includes a dual element probe assembly. Each element comprises an RTD sensor. The two RTD's are driven at different currents at a fixed ratio so that one RTD is self heated to establish a temperature differential. Wh... | 07/18/1995 |
