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Class Information
Number: 137/406
Name: Fluid handling > Liquid level responsive or maintaining systems > By weight of accumulated fluid > In communicating measuring vessel
Description: Apparatus in which the weight or pressure head of the liquid is sensed in a vessel which is separate from the liquid accumulation but is in communication therewith.

Sub-classes under this class:

Class Number Class Name Patents
137/407 Top and bottom connections 2

Patents under this class:

Patent Number Title Of Patent Date Issued
6325094 Self-metering reservoir Dec. 4, 2001
6019114 Self-metering reservoir Feb. 1, 2000
5715856 Liquid flow control apparatus Feb. 10, 1998
5358003 Method and apparatus for maintaining level of water in above-ground swimming pools Oct. 25, 1994
5154205 Method and apparatus for maintaining level of water in above-ground swimming pools Oct. 13, 1992
4607658 Water level control device Aug. 26, 1986
4598733 Apparatus for detecting the volume of blood in a blood reservoir Jul. 8, 1986
4448210 Apparatus and method for controlling the level of a liquid in a tank May. 15, 1984
3938539 Apparatus for leading off air in connection with the measuring of the flow of a liquid Feb. 17, 1976

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