| Patents for G05D 21 - Control of chemical or physico-chemical variables, e.g. ph-value (1,435) |
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| 09/20/1983 | US4405462 Automatic revitalization of sulfide processing and treatment solutions |
| 08/16/1983 | US4398554 Flux control device |
| 08/16/1983 | US4398503 Method and apparatus for metering a feed of hydrogen fluoride vapor |
| 07/26/1983 | CA1150801A1 Method and apparatus for ventilating an occupied space |
| 06/14/1983 | CA1148282A1 Anaerobic filter |
| 05/24/1983 | US4385357 Water treatment system and control therefor |
| 05/03/1983 | US4382173 System for automatically regulating water conductivity in an electrode-type humidifier evaporator |
| 04/27/1983 | EP0018971B1 P-ion controller and control of ionic concentration in a flow-line |
| 04/13/1983 | EP0076683A1 Apparatus and method for controlling the pH of a continuous process stream |
| 03/29/1983 | CA1143842A1 Apparatus for control and monitoring of the carbon potential of an atmosphere in a heat-processing furnace |
| 03/15/1983 | US4376701 Waste water treating apparatus |
| 02/22/1983 | US4374681 System for controlling the composition of chemical treatment baths |
| 02/16/1983 | EP0071988A1 Apparatus for automatically measuring and controlling chemical reaction amount |
| 02/15/1983 | CA1141110A1 Method and apparatus for controlling dissolved solid concentrations |
| 01/11/1983 | CA1139399A1 Method of and apparatus for controlling the concentration and stability of an emulsion |
| 01/04/1983 | US4367029 Method and apparatus for automatically controlling an activity of a developing liquid for use in a developer |
| 12/22/1982 | EP0067326A2 An oxygen concentration regulator |
| 11/23/1982 | US4360323 Proportioning pumping system for dialysis machines |
| 11/02/1982 | US4357236 Automatic addition of a corrosion inhibitor to a coolant system by osmotic pressure |
| 10/13/1982 | EP0062306A1 Metering and mixing device for an anticorrosion agent in connection with plants using a watery liquid |
| 10/12/1982 | US4353933 So that bath is useable for extended period without remaking |
| 10/12/1982 | CA1133258A1 Chemical concentration control system for fluid circulators |
| 10/05/1982 | US4352738 Anaerobic filter |
| 09/21/1982 | US4350717 Controlling electroless plating bath |
| 09/21/1982 | CA1132015A1 Apparatus for metering and controlling a feed of hydrogen fluoride vapour |
| 08/31/1982 | US4346673 Apparatus and method for metering and controlling a feed of hydrogen fluoride vapor |
| 07/20/1982 | US4340937 Automatic control for a pellet producing apparatus |
| 07/20/1982 | CA1128013A1 Automatic addition of a corrosion inhibitor to a coolant system by osmotic pressure |
| 07/13/1982 | US4338959 Device to automatically add a controlled amount of corrosion inhibitor in an engine cooling system |
| 07/06/1982 | US4337746 System for feedback control of air/fuel ratio in internal combustion engine |
| 07/06/1982 | EP0050150A4 Automatic control for a pellet producting apparatus. |
| 06/29/1982 | US4337468 Method and device for controlling concentration of ink for ink-jet printer |
| 05/18/1982 | US4330521 Process for the manufacture of aqueous solutions of alkali metal hypochlorite |
| 05/04/1982 | US4327759 Slurry producing apparatus |
| 04/28/1982 | EP0050150A1 Automatic control for a pellet producting apparatus. |
| 04/06/1982 | US4323092 Apparatus and process for detecting free chlorine |
| 03/17/1982 | EP0047483A1 Process for the control of liquid-conditioning in an evaporation plant |
| 02/16/1982 | US4315518 Sampling, electroless deposition |
| 02/16/1982 | US4315421 Method of controlling the concentration and stability of an emulsion |
| 02/02/1982 | US4314344 Method and apparatus for generating selected gas concentrations |
| 01/19/1982 | CA1116719A1 In-line .sub.ph and .sub.pion controller |
| 12/22/1981 | US4306581 Chemical concentration control system for fluid circulators |
| 12/22/1981 | CA1114672A1 Ink maintenance sensor |
| 12/22/1981 | CA1114637A1 Lower explosive limit (lel) control with automatic calibration capability |
| 10/29/1981 | WO1981003076A1 Automatic control for a pellet producing apparatus |
| 10/13/1981 | US4294656 Process for measuring the state of charge of suspensions and for controlling the addition of auxiliary agents to the suspensions |
| 09/29/1981 | US4292039 Method and apparatus for controlling dissolved solid concentrations |
| 09/08/1981 | US4288230 Measuring flow rate and density |
| 09/08/1981 | US4288062 Apparatus for control and monitoring of the carbon potential of an atmosphere in a heat-processing furnace |
| 09/01/1981 | CA1108235A1 End point quality control light circuit |
| 06/16/1981 | US4273146 Cooling tower operation with automated pH control and blowdown |
| 04/21/1981 | US4262776 Conveyor lubricating system |
| 04/08/1981 | EP0026591A1 Control of the pH or ion concentration of an electrolyte stream |
| 04/01/1981 | EP0025844A1 Method and device for producing a fluidic reaction mixture forming particularly a foamed plastic |
| 03/17/1981 | US4256695 Copper liquor control system |
| 03/03/1981 | CA1096612A1 Method of setting and controlling desired redox potentials in gases |
| 02/24/1981 | US4252139 Method and apparatus for automatically mixing a solution having a specified concentration |
| 02/17/1981 | US4251475 Method and apparatus for controlling the proportion of liquid and dry particulate matter added to a pelletizer |
| 01/21/1981 | EP0022597A1 Process and plant for preparing aqueous solutions of alkaline metal hypochlorite |
| 01/20/1981 | CA1093824A1 Metering device |
| 01/07/1981 | EP0021208A1 System for monitoring the constitution of the atmosphere of a heat-treating furnace |
| 12/30/1980 | US4242189 Hydrogen ions |
| 12/23/1980 | US4240879 Methods of measuring the concentrations of ions |
| 12/16/1980 | US4239623 Apparatus for producing gradient elution in a liquid chromatographic system |
| 12/16/1980 | US4239493 By controlling the control chemical feed by the feedback method |
| 12/11/1980 | WO1980002698A1 Control of the composition of the atmosphere of a heat treatment oven |
| 12/02/1980 | CA1090901A1 Apparatus for anodic protection against corrosion of metal objects in contact with electrically conductive media |
| 11/11/1980 | US4232700 Metering device |
| 10/14/1980 | CA1087711A1 Wet processing ph control |
| 09/23/1980 | US4223450 Methods and apparatus for controlling gas flows |
| 09/16/1980 | US4222497 System and method for monitoring and maintaining a predetermined concentration of material in a fluid carrier |
| 07/22/1980 | CA1082337A1 Process control circuit for metal-depositing baths |
| 07/10/1980 | WO1980001357A1 Pelletizing control |
| 07/09/1980 | EP0013182A1 Method and apparatus for controlling a pelletizing operation |
| 06/03/1980 | US4206157 Electromagnetic valves, sulfur dioxide |
| 05/27/1980 | US4204764 Noise rejecting compensation circuit for developing apparatus |
| 05/27/1980 | CA1078493A1 Device for automatically controlling desalination of electrolytic fluids in direct-flow electrodialysis apparatus |
| 05/13/1980 | US4202690 Setting and controlling desired redox potentials in gases |
| 05/13/1980 | US4202193 Apparatus for controlling the concentration and stability of an emulsion |
| 04/22/1980 | US4199813 Apparatus useful in exhaust dyeing |
| 04/15/1980 | CA1075682A1 Control of chemical reaction |
| 04/08/1980 | CA1075036A1 Apparatus and method for preparing a particle suspension |
| 02/26/1980 | US4190481 Apparatus for ion control of solutions |
| 01/01/1980 | US4181951 In-line pH and pIon controller |
| 11/29/1979 | WO1979000998A1 In-line ph and pion controller |
| 11/27/1979 | US4176031 Digital hypochlorous acid analyzer |
| 10/31/1979 | EP0005047A1 Water treatment system and control therefor |
| 10/23/1979 | CA1064680A1 Method of and system for controlling the claus chemical process |
| 08/14/1979 | US4164172 Method and apparatus for ventilating an occupied space |
| 05/15/1979 | CA1054729A1 Treatment of biologically-degradable material |
| 05/08/1979 | CA1054238A1 Control system for alumina reduction cells |
| 05/01/1979 | US4152235 Ion selective electrode |
| 05/01/1979 | US4152215 Apparatus for controlling pH of culture solution for a living organism |
| 05/01/1979 | CA1053812A1 Device for purifying sewer water in small sewer systems |
| 04/24/1979 | US4150495 LEL (lower explosive limit) control with automatic calibration capability |
| 04/04/1979 | EP0001226A2 Apparatus for determining the redox potential during the regeneration of contaminated, aqueous sulphuric-acid waste in Pauling apparatuses |
| 03/27/1979 | US4146474 Method and apparatus for controlling dampening water for use in printing machines |
| 03/13/1979 | US4144381 Converting hydrogen into electrolyte soluble compound |
| 03/13/1979 | US4143541 Method and device for measuring the characteristics of plastic fluid and control system for pouring the same into moulds |
| 12/19/1978 | US4130126 Ink maintenance sensor |