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Class Information
Number: 340/619
Name: Communications: electrical > Condition responsive indicating system > Specific condition > Fluent material > Material level > Liquid > Optical sensor
Description: Subject matter wherein the liquid level is detected by a device responsive to or conducting light rays.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7417552 |
Flood alarm |
Aug. 26, 2008 |
| 7403125 |
Flow cytometry system with bubble detection |
Jul. 22, 2008 |
| 7400266 |
Method for improving vision in a motor vehicle |
Jul. 15, 2008 |
| 7327273 |
Fluid monitoring device |
Feb. 5, 2008 |
| 7265662 |
Apparatus and method for inspecting containers |
Sep. 4, 2007 |
| 7234830 |
Optical switch |
Jun. 26, 2007 |
| 7116236 |
Oil tank sight glass monitor |
Oct. 3, 2006 |
| 7049622 |
Optical position sensor for determining the interface between a clear and an opaque fluid |
May. 23, 2006 |
| 7012272 |
Method for measuring the filling level of a liquid in a cavity having a sub-mm wide opening |
Mar. 14, 2006 |
| 6968739 |
Gauge and method for indicating a level of a liquid in a tank |
Nov. 29, 2005 |
| 6900733 |
Rain sensor, particular for a motor vehicle and method for mounting a rain sensor |
May. 31, 2005 |
| 6894619 |
Sensor for optically detecting foreign bodies particularly raindrops on a glass pane |
May. 17, 2005 |
| 6796264 |
Fluid flow monitor and indicator |
Sep. 28, 2004 |
| 6753785 |
Oil tank sight glass monitor |
Jun. 22, 2004 |
| 6746053 |
System for preventing parallel marketing of retail items |
Jun. 8, 2004 |
| 6703635 |
Method and apparatus for measuring the level of liquid using optical fiber strain gauge |
Mar. 9, 2004 |
| 6696966 |
Automatic salt level monitor for a water softening device |
Feb. 24, 2004 |
| 6668645 |
Optical fuel level sensor |
Dec. 30, 2003 |
| 6658933 |
Fill-level indicator for a liquefied-petroleum-gas tank |
Dec. 9, 2003 |
| 6656871 |
Method for production of catalyst |
Dec. 2, 2003 |
| 6612169 |
Apparatus for engine lubricant level detection |
Sep. 2, 2003 |
| 6599857 |
Method for production of catalyst |
Jul. 29, 2003 |
| 6583725 |
Motion sensor |
Jun. 24, 2003 |
| 6581461 |
Electro-optic sensor for levelmeter providing output signal with frequency modulated by surface level |
Jun. 24, 2003 |
| 6555837 |
Fluoropolymer fluid overfill probe |
Apr. 29, 2003 |
| 6529751 |
Optical detection and quantification of microair in blood |
Mar. 4, 2003 |
| 6484564 |
Liquid leakage sensor, paper for detecting liquid leakage, and holder for detecting liquid leakage |
Nov. 26, 2002 |
| 6452202 |
Apparatus for measuring level of liquid in tank |
Sep. 17, 2002 |
| 6448573 |
Fluoropolymer fluid overfill probe with infrared optical signal |
Sep. 10, 2002 |
| 6389239 |
Liquid detection device, fusing unit using the same, and electrophotographic apparatus |
May. 14, 2002 |
| 6331819 |
Device and method for operating a rain detector |
Dec. 18, 2001 |
| 6276901 |
Combination sight glass and sump oil level sensor for a hermetic compressor |
Aug. 21, 2001 |
| 6259370 |
Leak sensor |
Jul. 10, 2001 |
| 6236324 |
Elastic plate liquid level sensor |
May. 22, 2001 |
| 6218949 |
Liquid level monitoring and control apparatus |
Apr. 17, 2001 |
| 6218950 |
Scattered light fire detector |
Apr. 17, 2001 |
| 6215406 |
Apparatus and method for detecting ignited flammable gas in a conduit |
Apr. 10, 2001 |
| 6177874 |
Liquid supplying device for providing chemical solution with a liquid level sensor |
Jan. 23, 2001 |
| 6161395 |
Liquid level sensor |
Dec. 19, 2000 |
| 6148280 |
Accurate, rapid, reliable position sensing using multiple sensing technologies |
Nov. 14, 2000 |
| 6131471 |
Liquid level sensor |
Oct. 17, 2000 |
| 6121628 |
Method, gas turbine, and combustor apparatus for sensing fuel quality |
Sep. 19, 2000 |
| 6118134 |
Optical mass gauge sensor having an energy per unit area of illumination detection |
Sep. 12, 2000 |
| 6082392 |
Dual hose assembly and control system for truck-to-truck fuel transfer |
Jul. 4, 2000 |
| 6057772 |
Apparatus and method for optically sensing liquid level in cooking vessels |
May. 2, 2000 |
| 6048487 |
Recoating stereolithographic layers |
Apr. 11, 2000 |
| 6049088 |
Fluid overfill probe with anti-reflective guard |
Apr. 11, 2000 |
| 6041966 |
Enclosure for a bottom draining container |
Mar. 28, 2000 |
| 6040776 |
Collection of process effluent |
Mar. 21, 2000 |
| 6012606 |
Apparatus for detecting low liquid level in bottom-draining container |
Jan. 11, 2000 |
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