| Patents for G05D 21 - Control of chemical or physico-chemical variables, e.g. ph-value (1,435) |
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| 01/26/1994 | EP0580344A2 Process for detecting and dampening oscillatory reactive behavior |
| 01/13/1994 | DE4222145A1 Ozone detection in air or process gas for low concn. determn. - by periodically switching sensor feedline to line contg. ozone filter and utilising semiconductor sensor element for continuous ozone detection by resistance modification |
| 01/11/1994 | US5277166 Apparatus for controlling the rate of composition change of a fluid |
| 01/11/1994 | CA1326079C Process for conditioning and dewatering sludges |
| 12/16/1993 | DE4219164A1 Fluid flow inputs to a central cleaning or heat recovery unit in industrial applications - controlled by input throttle governed by monitoring total load to minimise the cost and complexity |
| 12/07/1993 | US5268092 Controlled automatic sealing using a soap |
| 11/16/1993 | US5262963 Automatic control system for phosphoric acid plant |
| 10/28/1993 | WO1993021359A1 Method of and apparatus for detecting concentration of chemical processing liquid and automatic control apparatus for the same method and apparatus |
| 10/26/1993 | CA1323710C Intermittent aeration type biological treatment process and system therefor |
| 10/06/1993 | CN1077035A Inversion rate assaying and control method for polymeric process of acrylic fibres |
| 09/29/1993 | EP0562747A2 Oxygen concentration or humidity controlling apparatus |
| 09/28/1993 | US5248577 Measuring, stotage and computing reactant feeds |
| 09/21/1993 | US5246594 Process for controlling the ph value of an acid scrubbing liquid |
| 09/21/1993 | US5246593 Measurement of concentration of dissolved solutes, calculation of solubility of solutes and adjustment of geothermal fluid |
| 09/21/1993 | US5246590 Water treatment to reduce fog levels controlled with streaming current detector |
| 09/21/1993 | US5246586 Apparatus and method for producing ultrapure water and method of controlling the apparatus |
| 09/16/1993 | WO1993017611A1 Self-optimizing detergent controller |
| 08/19/1993 | DE4204697A1 Water hardness and pH long term control e.g. in ponds, fish tanks etc. - by circulating part of water through ion exchange unit for reduced mineral content and volume of water circulated is regulated in relation to pH value |
| 08/18/1993 | EP0555714A2 Regulation of concentrations for thermal separation |
| 08/18/1993 | EP0473625B1 Device for dispensing disinfectants |
| 07/28/1993 | EP0552511A1 Method for controlling the PH of an ascorbic acid type developer |
| 07/27/1993 | CA1320750C Programmable multiple blender |
| 07/14/1993 | EP0550747A1 HETEROCYCLIC POLYMER HYDROGELS, PRODUCTION METHOD AND UTILIZATION AS INSOLUBLE pH REGULATING TABLETS |
| 07/13/1993 | US5227306 Method and apparatus for controlling the rate of chlorine dioxide generation |
| 07/13/1993 | US5227052 Water conditioning apparatus having reaction plates coupled to an astable oscillator |
| 07/07/1993 | EP0549904A1 Process for regulating the amount of treating agent for reducing the nitrogen oxide content of the exhaust gases from combustion processes |
| 06/30/1993 | CN2137374Y Differential concentration type automatic liquid drainage device |
| 06/29/1993 | US5224051 Fluid condition monitoring and controlling system for a metalworking fluid central system |
| 06/29/1993 | US5223433 Temperature stabilized fluid calibration system |
| 04/21/1993 | EP0537528A1 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 04/21/1993 | EP0537527A1 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 04/21/1993 | EP0537526A1 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 04/20/1993 | CA1316578C Electronic controller for a water purifying unit |
| 04/15/1993 | WO1993007089A1 Method of controlling wastewater purification plants using quality evaluation of measuring data |
| 04/12/1993 | CA2078807A1 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 04/12/1993 | CA2078747A1 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 04/10/1993 | CA2078749A1 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 03/04/1993 | WO1993004004A1 Computerized chemical injection system for hydrogen sulfide control in a waste water stream |
| 01/30/1993 | WO1993003077A1 HETEROCYCLIC POLYMER HYDROGELS, PRODUCTION METHOD AND UTILIZATION AS INSOLUBLE pH REGULATING TABLETS |
| 01/26/1993 | US5181467 Automatic dampening water replenisher |
| 01/05/1993 | US5176836 Water Purification, Iodine |
| 12/29/1992 | US5175502 Dilution of acid bath samples to reduce influence of metal salts, measuring density before and after dilution, measuring electroconductivity, computer controlled |
| 12/15/1992 | CA1311344C Regulation system of a chemical treatment installation used for performance improvement by variance attenuation of adjustment parameters |
| 12/02/1992 | EP0516205A1 Control method for the pH-value of an acid scrubbing solution |
| 11/03/1992 | US5160439 System for controlling coagulant treatment based on monitoring of plural parameters |
| 10/22/1992 | DE4140915A1 Control system for sewage treatment plant with single-stage activation tank - using fuzzy logic computer to derive regulating value, e.g. for rate of oxygen addn. from inexact measured and input data |
| 10/06/1992 | US5152252 Water treatment control system for a boiler |
| 10/01/1992 | DE4208598A1 Automatic addn. of antifoaming agent - used to prevent excessive foaming of machine tool lubricating emulsion in filter system tank |
| 09/24/1992 | DE4109198A1 Rapidly changing pH in zone between liq. and solid - by coating solid with cpd. having ionic gps. then applying voltage |
| 08/26/1992 | EP0499843A1 Method and apparatus for cleaning bottles |
| 08/05/1992 | EP0448613B1 Process for the continuous monitoring of waste water |
| 07/21/1992 | US5132916 Methodology for ph titration curve estimation for adaptive control |
| 07/01/1992 | EP0492927A2 Controlling fluids provided to a chromatographic detector |
| 07/01/1992 | EP0491810A1 Sensing method and device for aggregation control |
| 04/28/1992 | US5108929 Controlling ph in waste water treatment |
| 04/28/1992 | US5108655 Foam monitoring control system |
| 04/28/1992 | US5108466 Apparatus and methods for controlling fluids provided to a chromatographic detector |
| 04/21/1992 | CA1298960C Method for removing hydrogen chloride from exhaust gas discharged fromincinerator |
| 04/14/1992 | US5104527 Sensing light transmission; determining titration time; translating into amount of oxidant feed |
| 03/04/1992 | EP0472641A1 Fluid condition monitoring and controlling system for a metalworking fluid central system |
| 02/25/1992 | US5091095 System for controlling drain system treatment using temperature and level sensing means |
| 02/14/1992 | WO1992003772A1 Reactant concentration control method and apparatus for precipitation reactions |
| 02/14/1992 | CA2066605A1 Reactant concentration control method and apparatus for precipitation reactions |
| 02/13/1992 | DE4024947A1 Procedure for treatment of waste water - involves continuously monitoring flow rate, ph, temp. and compsn. in activated sludge tank to control water treatment process |
| 01/15/1992 | EP0411068A4 Assayomate |
| 12/04/1991 | CN1056756A Methodology for ph titration curve estimation for adaptive control |
| 11/27/1991 | EP0457989A1 Titration curve estimation for adaptive pH control |
| 09/05/1991 | WO1991013031A1 Water treatment |
| 08/06/1991 | US5037559 Addition of flocculants; comparing signals with no-minal values; separatio of liquid from solids |
| 06/18/1991 | US5025222 System and method for monitoring substances and reactions |
| 06/11/1991 | US5023803 Process to control the addition of carbonate to electrolytic cell brine systems |
| 05/17/1991 | CA2029549A1 Apparatus and method for detecting the presence and concentration of weak acids and bases in liquids |
| 04/04/1991 | WO1991004486A1 Sensing method and device for aggregation control |
| 04/02/1991 | US5004696 Automatic total reducers monitoring and adjustment system |
| 03/07/1991 | WO1991002964A1 Treatment of alkaline streams |
| 03/06/1991 | EP0415618A1 Apparatus for conducting and controlling chemical reactions |
| 02/06/1991 | EP0411068A1 Assayomate |
| 01/29/1991 | US4989157 Automated chemical milling controller |
| 01/24/1991 | WO1991000997A1 System and method for monitoring substances and reactions |
| 01/24/1991 | CA2350892A1 System and method for monitoring substances and reactions |
| 01/22/1991 | US4987083 Photometric analyzer and controller for beverages |
| 01/17/1991 | DE3921564A1 Controlling concn. of developer, coating remover sol. for PCB(s) - by measuring electrical conductivity of sol. circulated through measurement cell at defined temp. and adding sol or water accordingly |
| 12/19/1990 | EP0402704A1 Method of removing hydrogen sulphide from combustible exhaust gases |
| 12/11/1990 | US4976871 Method of monitoring flocculant effectiveness |
| 11/29/1990 | WO1990014623A1 Device for dispensing disinfectants |
| 11/29/1990 | DE3916910A1 Einrichtung zum dosieren von desinfektionsmitteln Means for dosing of disinfectants |
| 11/20/1990 | WO1990014624A1 Fluid condition monitoring and controlling system for a metalworking fluid central system |
| 11/20/1990 | US4971077 On-line tobacco evaluation system and method |
| 11/20/1990 | CA2057905A1 Fluid condition monitoring and controlling system for a metalworking fluid central system |
| 11/07/1990 | EP0396057A1 Control arrangement and process for controlling microbiological treatment of waste water |
| 10/03/1990 | EP0390254A2 Method for stabilizing cleaning baths for SI wafers, especially for semiconductor devices |
| 09/18/1990 | US4956887 Ratio of detergent concentration to water |
| 08/07/1990 | US4945939 pH control system for an aqueous liquid reservior |
| 07/11/1990 | EP0377284A2 Improved method and apparatus for regulating transmembrane ion movement |
| 07/10/1990 | US4940551 Method for pH control |
| 06/28/1990 | WO1990006900A1 Process for the continuous monitoring of waste water |
| 06/27/1990 | CN2058770U Multifunctional digital ion meter |
| 06/21/1990 | DE3842734A1 Verfahren zum kontinuierlichen ueberwachen von abwasser A method for continuously supervise of wastewater |
| 06/19/1990 | CA2005869A1 Method for continuous monitoring of effluent |
| 06/12/1990 | US4933870 Digital silver ion concentration controller for the precipitation of silver halide emulsions |