| Patents for G05D 21 - Control of chemical or physico-chemical variables, e.g. ph-value (1,435) |
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| 06/05/1990 | CA1270047A1 Method and apparatus for controlling the concentration of a chemical solution |
| 05/17/1990 | WO1990005293A1 Assayomate |
| 05/17/1990 | DE3838508A1 Controlling the carbon dioxide concentration of space stations |
| 04/25/1990 | EP0364542A1 An electronic controller for a water purifying unit. |
| 04/11/1990 | CN2055953U On-line automatic controller for solution ph value |
| 02/28/1990 | EP0356342A2 Digital silver ion concentration controller for the precipitation of silver halide emulsions |
| 02/27/1990 | US4905160 Device for regulating the operation of a chemical treatment plant, to improve efficiency by attenuation of the variances of the regulating parameters |
| 01/24/1990 | EP0351806A2 Method and device for flow control of two fluids |
| 12/12/1989 | US4886590 Chemical process control system |
| 10/24/1989 | US4876653 Programmable multiple blender |
| 10/05/1989 | WO1989009436A1 An electronic controller for a water purifying unit |
| 10/04/1989 | EP0335628A2 Method and system for automated synthesis of chemical products |
| 09/19/1989 | US4867193 Apparatus for controlling a soap concentration in cleaning solvent |
| 08/15/1989 | US4857750 Sensor for determining photoresist developer strength |
| 08/08/1989 | US4855061 Method and apparatus for controlling the coagulant dosage for water treatment |
| 07/25/1989 | US4851818 Electronic controller for a water purifying unit |
| 07/18/1989 | US4849098 Continuous water quality monitor |
| 07/11/1989 | US4847056 Reaction with slaked lime |
| 05/16/1989 | US4830757 Telemetry system for water and energy monitoring |
| 04/04/1989 | US4818408 Wastewater, activated sludge |
| 04/04/1989 | US4817659 Apparatus for automatically metering gas into liquid |
| 03/08/1989 | EP0306217A2 Concentrated toner solution and pressurized toner dispensing mechanism |
| 03/07/1989 | CA1250804A1 Moisture eliminator for air washer |
| 01/26/1989 | WO1989000736A1 Programmable multiple blender |
| 01/18/1989 | EP0299630A1 Programmable multiple blender |
| 01/11/1989 | CN2030721U Ph photoelectric integral test and control device |
| 12/28/1988 | EP0296500A1 Method for removing hydrogen chloride from exhaust gas discharged from incinerator |
| 12/14/1988 | EP0295173A1 Apparatus for regulating the operation a chemical treatment plant, for improving the efficiency by variance attenuation of setting parameters |
| 11/23/1988 | EP0292374A1 Method for air flow regulation in a waste water treatment plant |
| 10/13/1988 | DE3710992A1 Apparatus for controlling and monitoring a physical variable of a liquid, in particular the pH |
| 08/23/1988 | CA1241091A1 Computerized system for feeding chemicals into water treatment system |
| 08/09/1988 | US4762796 pH control of a process stream |
| 07/06/1988 | EP0273641A2 Photometric analyzer and controller for beverages |
| 06/29/1988 | EP0272673A2 Method for conditioning and dewatering sludges |
| 04/28/1988 | DE3733954A1 Circuit for the control of foam formation |
| 03/29/1988 | US4733798 Method and apparatus for controlling the concentration of a chemical solution |
| 03/16/1988 | EP0260187A2 Intermittent aeration type biological treatment process and system therefor |
| 03/09/1988 | EP0258445A1 Device for automatic dosage of gas into liquid |
| 01/05/1988 | US4716739 Shipping container |
| 12/15/1987 | US4713618 On-line calibration system for chemical monitors |
| 10/29/1987 | DE3614387A1 Process and apparatus for the controlled enrichment with carbon dioxide (CO2) of the air enclosed in a greenhouse |
| 10/21/1987 | EP0241818A2 pH buffering method |
| 10/01/1987 | DE3610766A1 Process and arrangement for preparing and metering a solution of chemicals |
| 09/30/1987 | EP0239106A2 Process for reducing the N0x content in gases, in which NH3 is continuously added to the gas stream |
| 08/27/1987 | WO1987005133A1 Device for automatic dosage of gas into liquid |
| 08/19/1987 | EP0232807A1 Apparatus and method for controlling chemical and physical processes in a plurality of devices suitable for this purpose |
| 04/21/1987 | US4660152 System and method for monitoring and maintaining concentrate material in a fluid carrier |
| 04/15/1987 | EP0218469A2 On-line calibration system for chemical monitors |
| 04/14/1987 | US4656843 In a cloth treating tank |
| 03/24/1987 | US4651729 Fluid flow regulator |
| 03/03/1987 | US4648043 Computerized system for feeding chemicals into water treatment system |
| 02/17/1987 | US4642996 Carriage of comestibles and in particular to containers and related means and methods suitable for such purposes |
| 01/27/1987 | US4639718 Boiler blowdown monitoring system and process for practicing same |
| 12/23/1986 | US4631530 Chemical process monitor |
| 12/09/1986 | US4627568 Moisture eliminator for air washer |
| 11/18/1986 | US4623968 Structured design and decentralized control of production installations |
| 09/17/1986 | CN86201534U Digital ph value-measuring and displaying controller |
| 08/26/1986 | CA1210474A1 Indexing controller system and method of automatic control of cooling water tower systems |
| 07/22/1986 | US4601306 Apparatus for ascertaining and/or keeping constant the mixing ratio of a liquid mixture |
| 05/13/1986 | US4589072 Apparatus for automatically measuring and controlling chemical reaction amount |
| 05/07/1986 | EP0180090A2 System and method for automatically monitoring and maintaining desired concentrations of metal plating baths |
| 03/12/1986 | EP0050150B1 Automatic control for a pellet producting apparatus |
| 03/05/1986 | EP0173403A2 Control method for a sorption-agent |
| 02/18/1986 | CA1200878A1 Structured design and decentralised control of production installations |
| 02/04/1986 | US4568465 Controlling a plurality of electrically actuatable valves by sensing the volume of water |
| 02/04/1986 | US4568464 Anaerobic filter |
| 01/28/1986 | US4567559 Apparatus for regulating a parameter by admitting an additive into a medium |
| 01/07/1986 | CA1199129A1 Control method and device for the ph level of the coolant in a pressurised water cooled nuclear reactor |
| 01/07/1986 | CA1199092A1 Blending control system |
| 01/07/1986 | CA1198971A1 Ph control of a process stream |
| 12/27/1985 | EP0165802A2 Method and apparatus for monitoring and maintaining concentrate material in a fluid carrier |
| 11/21/1985 | EP0161844A2 Method for feeding chemicals into a system |
| 11/06/1985 | EP0160437A2 Air conditioning system |
| 10/22/1985 | US4548226 Apparatus for adjusting the concentration of oil in a water-containing oil material |
| 10/16/1985 | EP0158142A2 Device for ascertaining and/or keeping the mixing ratio of a liquid mixture constant |
| 08/21/1985 | EP0151747A1 Process and apparatus for sewage sludge dewatering |
| 07/04/1985 | WO1985002836A1 Process and plant for dehydrating muds |
| 05/07/1985 | US4515643 Electrochemistry |
| 04/03/1985 | EP0136042A2 Improvements in and/or relating to the carriage of comestibles and in particular to containers and related means and methods suitable for such purposes |
| 03/19/1985 | US4505790 Oxygen concentration regulation |
| 01/22/1985 | CA1181486A1 Method and apparatus for measuring selected characteristics of fluids |
| 01/15/1985 | US4494209 Blending control system |
| 11/27/1984 | CA1178692A1 Fuel supply system for combustion engines |
| 10/02/1984 | US4474476 For offset printing |
| 08/22/1984 | EP0116192A1 Flux control device |
| 08/07/1984 | US4464315 Indexing controller system and method of automatic control of cooling water tower systems |
| 07/18/1984 | EP0113567A1 Control system and method of automatic control of cooling water tower systems |
| 07/17/1984 | US4460008 Indexing controller apparatus for cooling water tower systems |
| 06/13/1984 | EP0110111A1 Method and apparatus for controlling additive dispensers in waste water treatment systems |
| 05/02/1984 | EP0107491A2 Electrochemical method of testing for surface-characteristics, and testing apparatus for use in the method |
| 04/04/1984 | EP0104411A1 Structural concept and distributed control of production plants |
| 03/27/1984 | US4439038 Method and apparatus for measuring and controlling the color of a moving web |
| 03/27/1984 | US4438749 For controlling the air-fuel ratio in a fuel supply system |
| 02/15/1984 | EP0100649A2 Fluid flow regulator |
| 02/14/1984 | CA1162271A1 Device to automatically add a controlled amount of corrosion inhibitor in an engine cooling system |
| 11/23/1983 | EP0094884A1 Method and device for controlling the pH of the cooling water of a pressurized water nuclear reactor |
| 10/25/1983 | CA1155945A1 Method and apparatus for controlling the proportion of liquid and dry particulate matter added to a pelletizer |
| 09/27/1983 | US4406250 Apparatus for controlling electroless plating bath |
| 09/27/1983 | US4406249 Quantitative analysis |
| 09/27/1983 | US4406248 Quantitative analysis |