| Patents for G05D 21 - Control of chemical or physico-chemical variables, e.g. ph-value (1,435) |
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| 04/14/2004 | CN1489014A Glass bulb slurry level-concentration control system |
| 04/06/2004 | US6716359 Enhanced time-based proportional control |
| 04/01/2004 | WO2003076917A3 Device for measuring and regulating the ph-value of a medium |
| 02/19/2004 | DE10231908A1 Self-regulating parametric process for oxygenation of activated sludge in waste water treatment plant based on redox potential and/or pH value and waste water plant load |
| 02/11/2004 | CN1474244A 精密气体配比器 Precision gas ratio |
| 02/03/2004 | CA2214139C Self-optimizing detergent controller |
| 01/22/2004 | WO2003048875A3 Method for guaranteeing at least one characteristic of a fluid used for producing food products |
| 01/22/2004 | US20040011736 For controlling a wastewater treatment of using a microorganism that can degrade a specific compound |
| 01/02/2004 | EP1373600A1 Method of controlling solution concentration in strip cleaning line |
| 12/31/2003 | CN1464346A Self-adaptive control administration apparatus and process thereof |
| 12/31/2003 | CN1133104C 在生产过程中控制产品分配的装置和方法 Apparatus and method for controlling the distribution of products in the production process |
| 12/24/2003 | WO2003107109A2 Method and device for detecting and checking the quality or properties of a mixture of fluids, in particular a food or domestic mixture |
| 12/24/2003 | CN2594846Y Digital control air purifying system |
| 12/24/2003 | CA2490179A1 Method and device for detecting and checking the quality or properties of a mixture of fluids, in particular a food or domestic mixture |
| 12/17/2003 | CN1131431C Method to monitoring and controlling chemical treatment of petroleum, petrochemical and process with on-line quartz crystal microbalance sensor |
| 12/10/2003 | CN1460646A Operating controller for water purified factory |
| 12/10/2003 | CN1130608C Two-loop intelligent PH value measuring and controlling device and method |
| 12/09/2003 | CA2156880C Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler |
| 12/03/2003 | CN2589460Y Electric generator inner cooling water purifying installation |
| 11/25/2003 | CA2306807C Parallel reactor with internal sensing and method of using same |
| 11/18/2003 | US6650119 Method and apparatus for measurement and automatic control of acid concentration |
| 11/06/2003 | WO2003091815A1 Ozonated water flow and concentration control apparatus and method |
| 11/06/2003 | WO2003038386A3 Real-time component monitoring and replenishment system for multicomponent fluids |
| 11/05/2003 | CN1127004C Fluid supply apparatus |
| 10/29/2003 | CN1126232C Large electric generator internal cooling water ammoniation fuzzy controlling method, and monitoring and controlling system thereof |
| 10/29/2003 | CN1126231C Large electric generator internal cooling water microcirculation slow release controlling method and monitoring system |
| 10/21/2003 | US6634388 Annular fluid manipulation in lined tubular systems |
| 10/08/2003 | EP0877976B1 Self-optimizing detergent controller |
| 10/08/2003 | CN1447203A Passive mode method of adjusting mixing ratio of liquids and its devices |
| 10/02/2003 | WO2003011460A3 Self-regulating microfluidic device and method of using the same |
| 09/30/2003 | US6627006 Method of controlling a treatment line |
| 09/18/2003 | WO2003076917A2 Device for measuring and regulating the ph-value of a medium |
| 09/18/2003 | US20030175194 Purification by removing of oxides of sulfur (SOX) and oxides of nitrogen (NOX) gases; pollution control, air pollution, catalytic exhaust system |
| 09/10/2003 | EP1343063A2 Wastewater treatment control system, terminal, computer program and accounting method |
| 09/09/2003 | US6617165 Analyzing sample by selective adsorption, electrochemically, chromatographically, splitting into volatile compounds, stripping the compounds and detection thereof, or by electromagnetic radiation; use in metalworking industry |
| 09/04/2003 | US20030164338 Ozonated water flow and concentration control apparatus and method |
| 08/26/2003 | US6610263 System and process for removal of pollutants from a gas stream |
| 08/21/2003 | US20030157008 Denitrification, desulfurization; pollution control |
| 08/19/2003 | US6609070 Fluid treatment apparatus |
| 08/13/2003 | CN2566312Y Fully-automatic water treatment equipment controller |
| 08/05/2003 | US6601600 Annular fluid manipulation in lined tubular systems to enhance component mechanical properties and flow integrity |
| 07/10/2003 | WO2002009852A9 System and process for removal of pollutants from a gas stream |
| 07/03/2003 | US20030121799 Process control; monitoring concentration of hydrogen peroxide, hydroxylamine |
| 07/02/2003 | CN2559024Y Batch active sludge process fuzzy control device |
| 07/01/2003 | US6587753 Use of control matrix for boiler control |
| 07/01/2003 | US6584989 Comprises deionized water, sulfuric acid, an oxidant such as hydrogen peroxide, and hydrofluoric acid |
| 06/25/2003 | EP1141802B1 Apparatus and method for controlling distribution of product in manufacturing process |
| 06/17/2003 | US6579507 System and process for removal of pollutants from a gas stream |
| 06/12/2003 | WO2003048875A2 Method for guaranteeing at least one characteristic of a fluid used for producing food products |
| 06/05/2003 | US20030105247 Process for the controlled production of polyethylene and its copolymers |
| 06/04/2003 | EP1315546A2 System and process for removal of pollutants from a gas stream |
| 05/28/2003 | EP1314073A2 Time-based proportional control |
| 05/28/2003 | EP1069942B1 Parallel reactor with internal sensing and method of using same |
| 05/27/2003 | US6569336 Method, device and use of said method for biological elimination of metal elements present in an ionized state in water |
| 05/20/2003 | US6564700 Apparatus for producing a target pH in a foodstuff |
| 05/08/2003 | WO2003038386A2 Real-time component monitoring and replenishment system for multicomponent fluids |
| 04/30/2003 | CN1414393A Method of on line detecting acid bath components and its detecting apparatus |
| 04/30/2003 | CN1414391A Automatic correct quantitative control method of liquid treating compound |
| 04/29/2003 | US6556930 Fluid treatment apparatus |
| 04/23/2003 | EP1196239B1 Process and apparatus for preparing a composition of matter utilizing an ultrasonic device |
| 04/16/2003 | CN1105956C On-line control of chemical process plant |
| 04/02/2003 | EP1297343A1 Use of control matrix for boiler control |
| 03/26/2003 | CN1103626C System for diluting ultrapure chemicals which is intended for microelectronics industry |
| 03/13/2003 | US20030050736 Diluting system and method |
| 02/26/2003 | EP1284935A1 Use of control matrix for cooling water systems control |
| 02/25/2003 | US6523559 Self-regulating microfluidic device and method of using the same |
| 02/13/2003 | WO2003011460A2 Self-regulating microfluidic device and method of using the same |
| 02/13/2003 | CA2455168A1 Self-regulating microfluidic device and method of using the same |
| 02/06/2003 | WO2002009852A3 System and process for removal of pollutants from a gas stream |
| 01/30/2003 | US20030019520 Self-regulating microfluidic device and method of using the same |
| 01/22/2003 | EP1137599B1 Method for controlling the dosed quantities of water-treatment products |
| 01/21/2003 | US6510368 Performance-based control system |
| 01/16/2003 | US20030010364 Apparatus for fluid control with a substrate processing tank |
| 01/09/2003 | WO2002088860A3 Device for controlling chemical synthesis processes |
| 12/25/2002 | CN1387099A Method and device for fuzzy control of SBR process |
| 12/17/2002 | US6494961 Method of controlling solution concentration in strip cleaning line |
| 12/05/2002 | US20020180099 Continuous processing; emulsion polymerization |
| 12/04/2002 | EP1019330B1 Method for controlling aeration systems of biological tanks treating waste water |
| 12/03/2002 | US6489168 Analysis and control of parallel chemical reactions |
| 11/28/2002 | US20020176808 Process and apparatus for treating contaminated gas |
| 11/27/2002 | EP1259554A1 Process for the controlled production of polyethylene and its copolymers |
| 11/14/2002 | US20020168302 For removal of pollutants, such as oxides of sulfur, oxides of nitrogen, fly ash, mercury compounds, and elemental mercury from gases generated from the burning of fossil fuels |
| 11/12/2002 | CA2196785C Liquid enzyme doser |
| 11/07/2002 | WO2002088860A2 Device for controlling chemical synthesis processes |
| 10/31/2002 | WO2002057720A3 Method for regulating water concentration in a process stream |
| 10/31/2002 | DE10121194A1 Vorrichtung zur Steuerung von chemischen Syntheseprozessen An apparatus for controlling chemical synthesis processes |
| 10/29/2002 | US6471136 Biosensors for monitoring air conditioning and refrigeration processes |
| 10/24/2002 | US20020155057 Method for regulating water concentration in a process stream |
| 10/17/2002 | US20020150516 System and process for removal of pollutants from a gas stream |
| 10/17/2002 | US20020148485 Apparatus and method for wet cleaning |
| 10/16/2002 | EP1248950A2 Biosensors for monitoring air conditioning and refrigeration processes |
| 10/15/2002 | US6464799 Method for managing a fluid level associated with a substrate processing tank |
| 10/10/2002 | WO2002079544A1 Method of controlling solution concentration in strip cleaning line |
| 10/03/2002 | US20020139397 Aluminum strip is contacted with acid solution while passing through acid cleaning bath and concentration of acid in bath is adjusted by adding either concentrated acid or water to bath |
| 10/02/2002 | EP0710218B1 Monitoring biological activity in wastewater |
| 09/25/2002 | EP1147462A4 Performance-based control system |
| 09/19/2002 | US20020130666 Method and apparatus for measurement and automatic control of acid concentration |
| 09/10/2002 | US6447639 Process for controlling a digester using real time measurement of moisture content and species of wood |
| 09/05/2002 | US20020121349 Process for controlling a digester using real time measurement of moisture content and species of wood |
| 08/28/2002 | CN1089729C Method and device for monitoring biological activity and controlling treatment of waste water |