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Class Information
Number: 137/93
Name: Fluid handling > Self-proportioning or correlating systems > Mixture condition maintaining or sensing > By optical or chemical property
Description: Systems in which the condition maintained or sensed is an optical or chemical property.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4571092 |
Liquid mixing system |
Feb. 18, 1986 |
| 4552165 |
Method and device for maintaining density of a printed color constant |
Nov. 12, 1985 |
| 4536194 |
System for controlling the composition of a fuel gas produced by a jet compressor system |
Aug. 20, 1985 |
| 4506686 |
Physiochemically controlled scour jet array system |
Mar. 26, 1985 |
| 4494569 |
Apparatus for circulating and regenerating a degradable solution such as a saturable absorber for a laser |
Jan. 22, 1985 |
| 4494845 |
System for controlling the activity of developing solutions and apparatus for processing photosensitive materials |
Jan. 22, 1985 |
| 4477329 |
Apparatus for maintaining peroxide concentration |
Oct. 16, 1984 |
| 4474476 |
Chemical printing liquid method and system |
Oct. 2, 1984 |
| 4466072 |
Automatic fixed-quantity/fixed-time anti-oxidation replenisher control system |
Aug. 14, 1984 |
| 4464315 |
Indexing controller system and method of automatic control of cooling water tower systems |
Aug. 7, 1984 |
| 4460008 |
Indexing controller apparatus for cooling water tower systems |
Jul. 17, 1984 |
| 4435291 |
Breakpoint chlorination control system |
Mar. 6, 1984 |
| 4424703 |
Device for monitoring the concentration of an air-vapor mixture |
Jan. 10, 1984 |
| 4422152 |
Automatic fixed-quantity/variable-time anti-oxidation replenisher control system |
Dec. 20, 1983 |
| 4422085 |
Ink liquid viscosity control in an ink liquid supply system for an ink jet system printer |
Dec. 20, 1983 |
| 4372665 |
Automatic variable-quantity/fixed-time anti-oxidation replenisher control system |
Feb. 8, 1983 |
| 4372666 |
Automatic variable-quantity/variable-time anti-oxidation replenisher control system |
Feb. 8, 1983 |
| 4356834 |
Vapor feed regulator |
Nov. 2, 1982 |
| 4338959 |
Device to automatically add a controlled amount of corrosion inhibitor in an engine cooling system |
Jul. 13, 1982 |
| 4323092 |
Apparatus and process for detecting free chlorine |
Apr. 6, 1982 |
| 4323004 |
Installation for preparing multicomponent liquid mixes in production of strong alcoholic liquors |
Apr. 6, 1982 |
| 4315518 |
Methods of and system for controlling copper concentration in a solution |
Feb. 16, 1982 |
| 4306581 |
Chemical concentration control system for fluid circulators |
Dec. 22, 1981 |
| 4273146 |
Cooling tower operation with automated pH control and blowdown |
Jun. 16, 1981 |
| 4262776 |
Conveyor lubricating system |
Apr. 21, 1981 |
| 4256131 |
Feedback color control system |
Mar. 17, 1981 |
| 4236546 |
Electronic breathing mixture control |
Dec. 2, 1980 |
| 4232700 |
Metering device |
Nov. 11, 1980 |
| 4224154 |
Swimming pool chemical control system |
Sep. 23, 1980 |
| 4223450 |
Methods and apparatus for controlling gas flows |
Sep. 23, 1980 |
| 4211630 |
Electrolytic recovery of silver from photographic bleach-fix baths |
Jul. 8, 1980 |
| 4211517 |
Detergent supply control for automatic dishwasher |
Jul. 8, 1980 |
| 4206753 |
Method and apparatus for mixing gases |
Jun. 10, 1980 |
| 4204764 |
Noise rejecting compensation circuit for developing apparatus |
May. 27, 1980 |
| 4198151 |
System for replenishing developer |
Apr. 15, 1980 |
| 4197872 |
High pressure dispensing system for mixed liquids |
Apr. 15, 1980 |
| 4172880 |
Process and apparatus for automatically controlling the acid concentration in gas scrubbing solution |
Oct. 30, 1979 |
| 4170553 |
Process and apparatus for the controlled flocculating or precipitating of foreign substances from a liquid |
Oct. 9, 1979 |
| 4150670 |
Anesthesia detector and display apparatus |
Apr. 24, 1979 |
| 4144804 |
Apparatus for continuously controlling butterfat content of reconstituted milk |
Mar. 20, 1979 |
| 4129381 |
Apparatus and method for preparing a particle suspension |
Dec. 12, 1978 |
| 4121767 |
Mobile agricultural sprayer with additive concentration control |
Oct. 24, 1978 |
| 4119989 |
System for controlling concentration of developer solution |
Oct. 10, 1978 |
| 4091834 |
Apparatus for automatically preparing solution of controlled concentration |
May. 30, 1978 |
| 4091833 |
Device for detecting predetermined foaming conditions in fluids |
May. 30, 1978 |
| 4082666 |
End point quality control light circuit |
Apr. 4, 1978 |
| 4068677 |
Process control circuit for metal-depositing baths |
Jan. 17, 1978 |
| 4066092 |
Apparatus to regulate the pH value or other similar values of a solution |
Jan. 3, 1978 |
| 4060097 |
Automatic etching system |
Nov. 29, 1977 |
| 4057818 |
Automatic replenisher system for a photographic processor |
Nov. 8, 1977 |
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