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Class Information
Number: 137/91
Name: Fluid handling > Self-proportioning or correlating systems > Mixture condition maintaining or sensing > By specific gravity
Description: Systems in which the condition maintained or sensed is specific gravity.










Patents under this class:

Patent Number Title Of Patent Date Issued
7864062 Apparatus and method for detecting a change in a specific gravity of a fluid Jan. 4, 2011
6736153 Brining system, method, and apparatus May. 18, 2004
6439252 Liquid de-icer production apparatus and method Aug. 27, 2002
6129106 Proportioning valve and control means therefor Oct. 10, 2000
5751599 Probeless microprocessor based controller for open recirculating evaporative cooling systems May. 12, 1998
5567283 Caustic concentration regulator for chlorine generators Oct. 22, 1996
5551468 Fluidic density control for chlor alkali cells Sep. 3, 1996
5481968 Apparatus for continuous multiple stream density or ratio control Jan. 9, 1996
5478395 Process for supplying a gas, especially of diborane and silane Dec. 26, 1995
5447744 Process for supplying a gas, especially of diborane and silane Sep. 5, 1995
5388604 Method for adjusting the density of a liquid Feb. 14, 1995
5325852 Method and apparatus for adjusting the density of a liquid Jul. 5, 1994
5201337 Apparatus for mixing fluids of different specific gravity Apr. 13, 1993
5199453 Method for control of hard water scale deposition in evaporative cooling systems Apr. 6, 1993
5101851 Apparatus for control of hard water scale deposition in cooling systems Apr. 7, 1992
5013488 Apparatus for control of hard water scale in evaporative coolers May. 7, 1991
4982755 Flux density control system Jan. 8, 1991
4977915 Demulsifier control system and method Dec. 18, 1990
4969480 Method and apparatus for mixing and supplying fountain solution to printing press Nov. 13, 1990
4899774 Fluidic density control for chlor alkali cells Feb. 13, 1990
4726896 Method and apparatus for on-stream analysis of slurried ore Feb. 23, 1988
4724795 Automatic solution concentration monitoring system Feb. 16, 1988
4654802 Cement metering system Mar. 31, 1987
4601306 Apparatus for ascertaining and/or keeping constant the mixing ratio of a liquid mixture Jul. 22, 1986
4565085 Method of and apparatus for measuring the degree of gas charge in a liquid synthetic resin component Jan. 21, 1986
4548226 Apparatus for adjusting the concentration of oil in a water-containing oil material Oct. 22, 1985
4483357 Method for two stage in-line acid mixing Nov. 20, 1984
4474204 Delivery and metering device control system Oct. 2, 1984
4445526 System and method for controlling the specific gravity and viscosity of the slurry applied to television picture tube faceplates May. 1, 1984
4422085 Ink liquid viscosity control in an ink liquid supply system for an ink jet system printer Dec. 20, 1983
4398554 Flux control device Aug. 16, 1983
4362179 Method and apparatus for controlling ink viscosity Dec. 7, 1982
4327759 Slurry producing apparatus May. 4, 1982
4252139 Method and apparatus for automatically mixing a solution having a specified concentration Feb. 24, 1981
4206157 Fluid metering device Jun. 3, 1980
4131019 Method and apparatus for measuring specific gravity of liquids in process streams Dec. 26, 1978
4130126 Ink maintenance sensor Dec. 19, 1978
4024885 Process and apparatus for controlling the concentration of diazotype developing liquid May. 24, 1977
4015436 Method for controlling the capacity of a blower and a device for controlling the pressure in a liquefied gas storage tank utilizing said method Apr. 5, 1977
3952761 System for controlling density of liquids Apr. 27, 1976











 
 
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