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Class Information
Number: 340/623
Name: Communications: electrical > Condition responsive indicating system > Specific condition > Fluent material > Material level > Liquid > Float sensor
Description: Subject matter wherein the liquid level is sensed by the position of a buoyant object floating on the liquid surface.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7561040 |
Wireless probe system and method for a fueling environment |
Jul. 14, 2009 |
| 7489253 |
Fluid detection and containment apparatus |
Feb. 10, 2009 |
| 7486179 |
Low-level oil sensor |
Feb. 3, 2009 |
| 7456753 |
Internal pressure explosion-proof system |
Nov. 25, 2008 |
| 7418861 |
Mechanically self actuated liquid level sensor |
Sep. 2, 2008 |
| 7417552 |
Flood alarm |
Aug. 26, 2008 |
| 7403127 |
Device for establishing and/or monitoring a predetermined fill level in a container |
Jul. 22, 2008 |
| 7401571 |
Gutter system indicator for indicating a clogged or partially clogged condition |
Jul. 22, 2008 |
| 7307538 |
Pump connector system |
Dec. 11, 2007 |
| 7287482 |
Flotation safety device for vehicles |
Oct. 30, 2007 |
| 7265677 |
External device indicating that a tank is filled up |
Sep. 4, 2007 |
| 7230540 |
Liquid level alarm |
Jun. 12, 2007 |
| 7135981 |
Fuel level variation detector for marine vehicle |
Nov. 14, 2006 |
| 7116236 |
Oil tank sight glass monitor |
Oct. 3, 2006 |
| 7111510 |
Liquid level detection device |
Sep. 26, 2006 |
| 7094334 |
Water filter having a filter use time indicator |
Aug. 22, 2006 |
| 7068175 |
Water level warning device |
Jun. 27, 2006 |
| 7066024 |
Float adapted to track an interface between two liquids of differing density |
Jun. 27, 2006 |
| 7053782 |
Fuel overflow alarm system |
May. 30, 2006 |
| 7013728 |
System for detecting level of liquid in tank |
Mar. 21, 2006 |
| 7004650 |
Developing device using a developing liquid and image forming apparatus including the same |
Feb. 28, 2006 |
| 6972685 |
Liquid level sensor |
Dec. 6, 2005 |
| 6937155 |
Toilet annunciator |
Aug. 30, 2005 |
| 6910498 |
Liquid level controller |
Jun. 28, 2005 |
| 6843414 |
Smart container for bulk delivery |
Jan. 18, 2005 |
| 6822565 |
Wireless gauge alert |
Nov. 23, 2004 |
| 6798346 |
Device for floating an automobile and communication in an emergency |
Sep. 28, 2004 |
| 6753785 |
Oil tank sight glass monitor |
Jun. 22, 2004 |
| 6748805 |
Multiple input level sensor |
Jun. 15, 2004 |
| 6741180 |
Beverage dispensing URN with electronic display |
May. 25, 2004 |
| 6730865 |
Electrical inductance overflow switch system |
May. 4, 2004 |
| 6727822 |
Liquid level sensor apparatus and method of using thereof |
Apr. 27, 2004 |
| 6715349 |
Fluid-gauging systems and methods |
Apr. 6, 2004 |
| 6711949 |
Remote fluid level detection system |
Mar. 30, 2004 |
| 6708562 |
Level gauge for oil-filled transformers, chokes and tap changers |
Mar. 23, 2004 |
| 6679286 |
Ball tap with a water level switch |
Jan. 20, 2004 |
| 6657545 |
Automatic detecting and prewarning system for medicine instiller |
Dec. 2, 2003 |
| 6591676 |
Device for detecting the level of liquid, particularly for submersed pumps |
Jul. 15, 2003 |
| 6561022 |
Position encoder |
May. 13, 2003 |
| 6557412 |
Non-fouling liquid level control |
May. 6, 2003 |
| 6543471 |
Water heater fail safe apparatus |
Apr. 8, 2003 |
| 6536277 |
Level-tracing water-monitoring apparatus |
Mar. 25, 2003 |
| 6530274 |
Apparatus for liquid level measurement in a container |
Mar. 11, 2003 |
| 6529134 |
Remote adjustment device and method |
Mar. 4, 2003 |
| 6523405 |
Portable bin full indicator |
Feb. 25, 2003 |
| 6513378 |
Liquid level float switch with manual reset |
Feb. 4, 2003 |
| 6508119 |
Liquid level measurement and fuel transducer using anisotropic magnetoresistance device |
Jan. 21, 2003 |
| 6508118 |
Level transmitter for a liquid container, and method for determining a level in a liquid container |
Jan. 21, 2003 |
| 6486786 |
Water-monitoring apparatus with anchor |
Nov. 26, 2002 |
| 6481278 |
Hall-effect fine resolution liquid level indicator |
Nov. 19, 2002 |
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