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Class Information
Number: 137/386
Name: Fluid handling > Liquid level responsive or maintaining systems
Description: Apparatus which includes an element which senses the level of a liquid in means to receive an accumulation thereof and in response thereto exercises a control of the flow of fluid or acts to maintain that level of the liquid.










Sub-classes under this class:

Class Number Class Name Patents
137/453 Barometric 33
137/409 By float controlled valve 48
137/403 By weight of accumulated fluid 78
137/391 Control of both inflow and outflow of tank 92
137/395 Control of outflow from tank 62
137/392 Electrical characteristic sensing 258
137/388 Liquid excluding devices for gas inlet or outlets 13
137/387 Washing machine cycle control 48
137/393 With control fluid connection at desired liquid level 85
137/389 With second diverse control 56
137/400 With supplemental or safety closing means or bias 24


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8689940 Lubrication system for a breaking tool Apr. 8, 2014
8657161 Beverages dispenser and a method for dispensing beverages Feb. 25, 2014
8651127 Method for operating a sanitary tank for a rail vehicle Feb. 18, 2014
8622079 Method for extending the usage life of oil in a deep fat fryer Jan. 7, 2014
8607817 Control method and device of filled water volume in fluid space Dec. 17, 2013
8591147 Combined water storage and detention system and method of precipitation harvesting and management Nov. 26, 2013
8550288 Beverage container with electronic image display Oct. 8, 2013
8463445 Method and system for safe drum water level determination in a combined cycle operation Jun. 11, 2013
8371323 Method and apparatus for transporting a particulate material Feb. 12, 2013
8091579 Level sensor Jan. 10, 2012
8066029 Persuasive environmental recovery system Nov. 29, 2011
7970528 Gaseous fuel management system for automotive vehicle Jun. 28, 2011
7951504 Fuel cartridge May. 31, 2011
7882897 Device for limiting the ultimate consequences of a failure to bring under control a mass fire in a storage bin for hazardous materials Feb. 8, 2011
7849871 Method and apparatus for controlling a fluid system Dec. 14, 2010
7818092 In situ emission measurement for process control equipment Oct. 19, 2010
7757709 Integrated jet fluid level shutoff sensor and fuel tank vent for vehicles Jul. 20, 2010
7684899 Process controller having improved surge capacity control and related methodology Mar. 23, 2010
7591277 Fuel balancing system Sep. 22, 2009
7451789 Tank car loading control and monitoring system and method Nov. 18, 2008
7258130 Integrated jet fluid level shutoff sensor and fuel tank vent for vehicles Aug. 21, 2007
7189365 Liquid treating equipment including a storage vessel and a discharge vessel Mar. 13, 2007
7129832 High/low level alarm controller Oct. 31, 2006
7042362 Apparatus for monitoring leakage of process cooling water in furnace May. 9, 2006
7004185 Liquid loading techniques Feb. 28, 2006
6964278 Non-invasive gauge glass liquid level sensor apparatus Nov. 15, 2005
6938633 Method and apparatus for supplying process liquid for machine tool Sep. 6, 2005
6932097 Acoustic control of the composition and/or volume of fluid in a reservoir Aug. 23, 2005
6910498 Liquid level controller Jun. 28, 2005
6868861 Level control system for sheet casting process Mar. 22, 2005
6837262 Non tank pressurizing fast fill receiver and system for vehicles Jan. 4, 2005
6837263 Liquid level control system Jan. 4, 2005
6799471 System and method for conditioning and detection of moisture damage in asphalt mixes Oct. 5, 2004
6684902 Dual sensor liquid accumulator Feb. 3, 2004
6591862 System and method for carrying out column tests under hydrostatic pressure Jul. 15, 2003
6311711 Method of regulating the level in a buffer tank Nov. 6, 2001
6305404 Device for regulating the contents of a container Oct. 23, 2001
6303005 Process and device for producing high-purity liquid chemicals Oct. 16, 2001
6208943 Fluid flow measurement correcting system and methods of constructing and utilizing same Mar. 27, 2001
6155107 Engine oil level detector for a vehicle Dec. 5, 2000
6123765 Continuously fed single bubbler for epitaxial deposition of silicon Sep. 26, 2000
6085652 Ink fountain with a fountain roller in the inking mechanism of printing presses Jul. 11, 2000
6026843 Valve box manifold system and distribution method Feb. 22, 2000
6019114 Self-metering reservoir Feb. 1, 2000
5992447 Device for filling vinyl lined pools Nov. 30, 1999
5966311 Method of overfill probe identification and control Oct. 12, 1999
5921428 Self-metering reservoir Jul. 13, 1999
5904169 Apparatus for and method of treating substrate May. 18, 1999
5881753 Passive fluid level controller Mar. 16, 1999
5671773 Automatic fluid-supply apparatus for a boiler system Sep. 30, 1997

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