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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:
1 2 3 4

Patent Number Title Of Patent Date Issued
8701746 Optically detected liquid depth information in a climate control unit Apr. 22, 2014
8679326 Medical apparatus for extracorporeal treatment Mar. 25, 2014
8643498 Optical switches for tank environments Feb. 4, 2014
8638226 Method and device for determining a leak in a system component and/or for determining a state of a system component Jan. 28, 2014
8624709 System and method for camera control in a surveillance system Jan. 7, 2014
8619768 Method for dynamic sensor network processing Dec. 31, 2013
8594851 Wastewater collection flow management system and techniques Nov. 26, 2013
8487776 Duct grease deposit detection devices, systems, and methods Jul. 16, 2013
8456311 Sensor with mount Jun. 4, 2013
8441368 Radiation guide for a detector, scattered radiation detector May. 14, 2013
8410946 Thermal measurement system and method for leak detection Apr. 2, 2013
8358216 Liquid level detecting device and sample applying system Jan. 22, 2013
8314711 Optical switch Nov. 20, 2012
8269639 Particle monitors and method(s) therefor Sep. 18, 2012
8248256 Non-contact flood and moisture detector Aug. 21, 2012
8212682 Method and device for easily monitoring the maintenance status of an UV-drinking water disinfection system in an aircraft Jul. 3, 2012
8193909 System and method for camera control in a surveillance system Jun. 5, 2012
8085157 Smoke detectors Dec. 27, 2011
8054187 Apparatus and method for measuring precipitation Nov. 8, 2011
8044812 Optical wireless sensor network Oct. 25, 2011
8009052 Method and system for monitoring the power state of an X-ray emitter and/or an X-ray detector Aug. 30, 2011
7902989 Optical switch Mar. 8, 2011
7889086 Camera arrangement in a motor vehicle Feb. 15, 2011
7746239 Light scattering type smoke detector Jun. 29, 2010
7714732 Optical switch May. 11, 2010
7652563 Optical input device Jan. 26, 2010
7643766 Device for measuring concentration of toner in liquid developer, image forming apparatus provided therewith, and method for measuring toner concentration Jan. 5, 2010
7633398 Apparatus and method for measuring precipitation Dec. 15, 2009
7507982 Rain sensor with ambient light compensation Mar. 24, 2009
7492272 High liquid alarm system Feb. 17, 2009
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

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