Class 200/190 - Liquid level responsive

Subclass of Class 200 - Electricity: circuit makers and breakers
Definition: Subject matter wherein electrical connection of the liquid
No. of patents: 30
Last issue date: 06/06/2006

Number	Title	Issue Date
7057507	Flood detection and alarm system A system for monitoring leaks in dwellings that includes a sensor which detects water flow. The system determines that a leak is occurring when water has flowed through a water line for longer than a preselected period of time. A central monitoring system receives a...	06/06/2006
7019235	Photoimaged channel plate for a switch Disclosed herein is a channel plate for a fluid-based switch. The channel plate is produced by 1) depositing a photoimagable dielectric layer onto a substrate, 2) photoimaging at least one channel plate feature on the dielectric layer, and 3) developing the dielectr...	03/28/2006
6730866	High-frequency, liquid metal, latching relay array An electrical relay array using conducting liquid in the switching mechanism. The relay array is amenable to manufacture by micro-machining techniques. In each element of the relay array, two electrical contacts are held a small distance apart. The facing surfaces o...	05/04/2004
6595051	Fluid level sensing and control system An improved pressure activated control apparatus is provided for sensing fluid pressure and triggering one or more switches in response to the fluid pressure, as desired. The apparatus is designed to be placed within a fluid of a reservoir. The apparatus ...	07/22/2003
6523562	Plumbing flood control system A control system for stopping a plumbing-related flooding situation in a building includes at least one sensor for accumulating water and producing a low voltage electrical control signal when sufficient water is accumulated. An actuating system receives ...	02/25/2003
6488826	Fluid electrode system for resistive slope sensors An electrode electrolyte system is provided that is capable of operating in slope sensors in a wide range of temperatures. The eletrolytic system is characterized by a stable conductivity at high temperature and by low toxicity. The slope sensor can be in...	12/03/2002
6275160	Multi-mode waterflow detector with electronic timer A flow detector includes solid state delay circuitry coupled to a flow indicating device. In response to flow being indicated, the delay circuitry is enabled. After a preset delay interval, if flow is still being indicated, an output signal can be generat...	08/14/2001
6084521	Waterflow detector with electronic timer A flow detector includes solid state delay circuitry coupled to a flow indicating device. In response to flow being indicated, the delay circuitry is enabled. After a preset delay interval, if flow is still being indicated, electrical energy can be provid...	07/04/2000
5815079	Device for establishing and/or monitoring a predetermined filling level in a container A description is given of a sturdy device for establishing and/or monitoring a predetermined filling level in a container, which device exhibits a housing (1), two oscillating rods (3, 4) projecting into the container, a first diaphragm (2) which is fixed...	09/29/1998
5751074	Non-metallic liquid tilt switch and circuitry An electrical switch sensitive to an externally applied inertial and gravitational force, having an enclosure with a closed space; a conductive fluid filing a first portion of the space and a non-conductive medium filling a second portion of the space, th...	05/12/1998
5727421	Apparatus and method for providing leak proof sealing between a metal rod and a plastic housing molded there around An apparatus and method for providing liquid and gas proof sealing between a metal rod and a plastic housing molded there around. The rod includes a plurality of annular intrusions or protrusions along a length thereof. The plastic material is formed arou...	03/17/1998
5506564	Marine craft fuel alert system A marine craft fuel alert system is operative during a given time period, to compare actual fuel capacity measurements with selected fuel tank capacity reference values, to permit timely intervention. Used with a relatively high reference value and operat...	04/09/1996
5438323	Fail safe fluid level detection circuit A fail safe output stage for a tank fluid level detection circuit having power supply/output leads periodically places a shunt across the leads to periodically generate a LOW signal which alternates with a HIGH signal to indicate an underfilled condition....	08/01/1995
5403449	Methods and apparatus for electrically coupling electrical conductors with a conductive alloy having a low melting point Methods and apparatus are provided for coupling two similar or different types of bus bar conductors, where a conductor strap of each bus bar is submersed in a low melting point conductive alloy contained in a chamber. One of the conductor straps may be f...	04/04/1995
5267580	Dishwashing machine and method A conveyor dishwashing machine in which racks of dishes are conveyed from a loading surface through a hood which presents washing and rinsing zones and onto a discharge surface. In the washing zone, wash spray is applied to the dishes from a spray system ...	12/07/1993
5239285	Low salt level sensor A low salt level sensor comprising a float within a brine tank, apparatus for detecting whether the float has risen in response to the addition of a predetermined amount of water to the brine tank to a height such that an adequate supply of salt is presen...	08/24/1993
5198628	Shock insensitive tilt switch with floating spherical restrictor to inhibit flow of conductive liquid A tilt switch comprises a housing forming a cylindrical inner chamber and having two electric terminals extending through an end wall of the chamber. A mercury mass of less volume than the chamber is disposed within the chamber and is arranged to electric...	03/30/1993
5140303	Submersible electronic fuel level signal damper A liquid level responsive sending unit is positionable in a vehicle fuel tank to deliver a signal to a fuel gage on the vehicle dashboard. An electrical damping circuit is provided on a circuit board carried on the sending unit, such that momentary fluctu...	08/18/1992
4967181	Fuel level gauge provided with an apparatus for issuing a warning on the amount of remaining fuel A fuel level gauge provided with a remaining-amount warning apparatus is arranged so that an indicating needle for indicating the amount of fuel remaining in a fuel tank operates in accordance with a change in the resistance of a resistor device consistin...	10/30/1990
4949070	Locomotive lubrication level monitor A lubricant level monitor for gear covers of locomotives uses a vacuum probe tube to determine if the lubricant is below a predetermined level. The vacuum is only activated if the locomotive has been at rest for a predetermined period of time, so that the...	08/14/1990
4878043	Device for indicating hydroculture-related values A device for indicating values which are of interest in hydroculture applications is characterized in that the device includes a tube open at one end thereof and attached to a vessel at another end thereof. A probe including a sensor is disposed proximate...	10/31/1989
4804947	Water sensing apparatus A water sensing apparatus has a housing and a circuit within the housing. An alarm, e.g. a piezoelectric horn, is driven by the circuit. An elongate sensor is secured to the housing and is connected to the circuit. The other end of the sensor is adapted f...	02/14/1989
4638291	Sensor assembly for a radiator mounted coolant level monitoring system An electrically conductive liquid level sensor utilizing a pair of parallel closely spaced electrically conducting probes that are exposed within a liquid container for immersion in said liquid. The sensor includes an electrical insulator partition extend...	01/20/1987
4638305	Apparatus for detecting water in fuel Diesel fuel tends to deposit an insulating coating on surfaces it contacts. A probe, preferably in the form of a siphon tube, is coupled to a detection circuit which is responsive to either low resistance or high capacitance between the probe and ground. ...	01/20/1987
4575597	Float switch assembly having mercury-type switch movably retained within a cage A position responsive switch apparatus comprising a housing and a mounting assembly secured within the housing. The mounting assembly includes a pair of oppositely disposed spaced-apart walls. Each of the walls has an aperture contained therein which are ...	03/11/1986
4572934	Mercury switch The present invention relates to a mercury switch (10) including an outer metal housing (12) having a closed end and an open end. A baffle member (14) is positioned in the housing (12) immediate of the closed and open ends. The baffle member (14) defines ...	02/25/1986
4529854	Mercury switch The present invention relates to a mercury switch (10) including an outer metal housing (12) having a closed end and an open end. A baffle member (14) is positioned in the housing (12) immediate of the closed and open ends. The baffle member (14) defines ...	07/16/1985
4316239	Trunk lamp assembly A trunk lid lamp assembly comprising a housing having a first generally tubular part having open ends and a second generally tubular part having a closed end wall with interengaging means which provide a snap fit between said parts. The first part has an ...	02/16/1982
4087706	Electronic level switch control setup The present application presents a setup utilizing a float in an enclosed space as a bridging contact, on the basis of the liquid level in the area to control, to activate a semiconductor relay having a time delay for such activation, and is especially va...	05/02/1978
3939470	Liquid level detecting and indicating system for vehicle An improved liquid level detecting and indicating system for vehicles comprising a pair of liquid level detecting elements which are arranged in opposite positions on the detecting level of a liquid in a liquid container installed in a vehicle, whereby wh...	02/17/1976

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Class 200/190 - Liquid level responsive