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Class Information
Number: 137/453
Name: Fluid handling > Liquid level responsive or maintaining systems > Barometric
Description: Apparatus in which atmospheric pressure is utilized for maintaining a liquid level by balancing such pressure against a hydrostatic head.










Sub-classes under this class:

Class Number Class Name Patents
137/454 With shut-off between supply tank and receiver 19


Patents under this class:

Patent Number Title Of Patent Date Issued
7997298 Device for regulation of a concentration for a product in a liquid Aug. 16, 2011
7392820 Liquid shut-off valve Jul. 1, 2008
7143781 Flexible bladder apparatus for fluid flow control Dec. 5, 2006
6591862 System and method for carrying out column tests under hydrostatic pressure Jul. 15, 2003
5718261 Cleaning solution dispenser for use in a water tank, and water tank capable of discharging mixture of water and cleaning solution Feb. 17, 1998
5678600 Filling valve Oct. 21, 1997
5653533 Apparatus and method for introducing liquid additives into a concrete mix Aug. 5, 1997
5486285 Air inlet valve for water cooler Jan. 23, 1996
5339858 Device for restoring a fluid level in a fluid receptacle Aug. 23, 1994
4921639 Ultrasonic humidifier May. 1, 1990
4653529 Plant watering device Mar. 31, 1987
4619072 Method and apparatus for irrigating plants Oct. 28, 1986
4617806 Liquid level control apparatus Oct. 21, 1986
4607399 Automatic pool water regulator apparatus Aug. 26, 1986
4566484 Liquid level control apparatus Jan. 28, 1986
4449477 Liquid dispenser May. 22, 1984
4441520 Hydraulic fluid reservoir system Apr. 10, 1984
4368593 Device for storage and dosed delivery of liquids Jan. 18, 1983
4347687 Watering system for flower pots and plant boxes Sep. 7, 1982
4342376 Adjustable constant level oiler and tool for making adjustments Aug. 3, 1982
4311114 Low shear gravity controlled yarn finish supply system Jan. 19, 1982
4240991 Humidifier Dec. 23, 1980
4195652 Liquid level control for a transmission sump Apr. 1, 1980
4176694 Automatic shutoff liquid dispensing valve Dec. 4, 1979
4154194 Apparatus for coating a viscous medium onto predetermined surface portions of workpiece members May. 15, 1979
4142976 Barometric leg for rotary vacuum filter Mar. 6, 1979
4108201 Sensing probe for gravity induced flow liquid level regulator Aug. 22, 1978
4096879 Adjustable fluid flow regulator Jun. 27, 1978
4047655 Liquid level control means and method Sep. 13, 1977
4033483 Remote liquor dispensing system Jul. 5, 1977
4033289 Fluid flow distribution device and strip oiler system utilizing the same Jul. 5, 1977
3983958 Method and apparatus for observing, indicating and maintaining fluid level Oct. 5, 1976
3941147 Level control for surface treatment baths Mar. 2, 1976











 
 
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