| Patents for G05D 21 - Control of chemical or physico-chemical variables, e.g. ph-value (1,435) |
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| 04/10/1996 | EP0705431A1 Temperature stabilized fluid calibration system |
| 04/04/1996 | DE19502635A1 Flue gas desulphurisation device operation |
| 04/03/1996 | CN1119615A Enable system for a controlled atmosphere system for a refrigerated container |
| 03/20/1996 | CN1118759A Controlled atmosphere system for a refrigerated container |
| 03/12/1996 | US5499197 Intelligent and all-bearing control circuit device of reverse osmosis drinking water machine |
| 03/06/1996 | EP0496877B1 Reactant concentration control method and apparatus for precipitation reactions |
| 02/29/1996 | DE4430414A1 Chemical plant prod. correctly dispensed chemical prods. with integrated personnel and equipment protection |
| 02/07/1996 | EP0695720A1 Method for monitoring and controlling an installation for the biological treatment of waste water |
| 01/17/1996 | EP0692199A2 Refrigeration controller for refrigerated container with enabling system for a atmosphere controller |
| 01/16/1996 | US5485099 Sensing method and device |
| 01/02/1996 | US5480555 Control system for a water softener, control device therefor and methods of making the same |
| 12/20/1995 | EP0687966A2 Controlled atmosphere system for a refrigerated container |
| 11/14/1995 | US5466604 Apparatus for monitoring biological activity in wastewater and controlling the treatment thereof |
| 11/09/1995 | DE4415602A1 Aerobic sewage treatment process |
| 10/25/1995 | EP0678203A1 METHOD FOR THE CONTINUOUS MEASUREMENT AND ADJUSTMENT OF THE pH OF AN ACIDIC LIQUID, pH MEASUREMENT BEING BY MEANS OF A GLASS ELECTRODE. |
| 10/17/1995 | US5457963 Controlled atmosphere system for a refrigerated container |
| 10/03/1995 | US5454918 Continuously monitoring |
| 09/20/1995 | EP0672448A1 Water quality monitor for a water purification system |
| 09/19/1995 | US5450870 Method and an apparatus for detecting concentration of a chemical treating solution and an automatic control apparatus thereof |
| 09/12/1995 | US5449495 Nitrogen oxide removal control apparatus |
| 09/05/1995 | US5448499 Mispour-misfill prevention apparatus and process |
| 08/23/1995 | EP0668251A1 Method and apparatus for polishing or matting glass surfaces in a polishing bath |
| 08/17/1995 | DE4402769A1 Regulation of bio-reactor process |
| 08/10/1995 | DE4403682A1 Automatic pH adjustment loops for potable water treatment plant |
| 08/08/1995 | US5439569 Concentration measurement and control of hydrogen peroxide and acid/base component in a semiconductor bath |
| 06/20/1995 | US5425928 Quantity used is regulated as a function of the nitrogen monoxide content |
| 06/13/1995 | US5424939 Automatic water injector for wet mop cleaner and water injection method thereof |
| 06/06/1995 | US5422014 For water reservoirs, e.g. swimming pools, air conditioning cooling towers, having a recirculation system monotoring pH, oxygen reduction potential and bactericide and acid dosage |
| 06/06/1995 | US5421967 Chemically modified electrodes and method of using same in removing metals from a fluid |
| 05/24/1995 | CN1028569C Methodology for PH titration curve estimation for adaptive control |
| 05/04/1995 | DE4405278C1 Process and apparatus for polishing or matting glass surfaces in an acid bath |
| 04/11/1995 | US5404893 Self-optimizing detergent controller |
| 04/06/1995 | DE4333579A1 Process for controlling amounts of chemical auxiliaries and flocculating agents in dependence on an on-line mass/solid measurement for clarification and dewatering processes of all types, and plant for carrying out the process |
| 04/05/1995 | EP0646409A1 System for controlling the color of compounded polymer(s) using in-process color measurements |
| 04/04/1995 | US5403521 Blow system and a method of use therefor in controlling the quality of recycle cooling water in a cooling tower |
| 04/04/1995 | US5403472 Sensor to detect presence or absence of designated quantity of bromine in stream |
| 03/28/1995 | US5401412 Method and apparatus for monitoring biological activity in wastewater and controlling the treatment thereof |
| 03/23/1995 | DE4331505A1 Method and device for detecting and controlling solids concentration in an activated sludge reservoir of a biological clarification (sewage treatment) plant |
| 03/22/1995 | EP0643672A1 Method of controlling wastewater purification plants using quality evaluation of measuring data. |
| 03/15/1995 | CN1100212A Automatic water injector for wet mop cleaner and water injection method thereof |
| 03/09/1995 | DE4415563A1 Process for the recovery of water lacquer |
| 03/02/1995 | WO1995006008A1 Control of bromination of drinking water |
| 03/01/1995 | EP0640747A1 Boiler system pH/phosphate program control method |
| 02/28/1995 | US5393853 Hydrogels of heterocyclic polymer, method of obtaining them, and their use as insoluble pH-regulating pellets |
| 02/23/1995 | WO1995005605A1 Automated method for controlling the rate of chlorine dioxide generation |
| 02/16/1995 | WO1995004957A1 Virtual continuous emission monitoring system with sensor validation |
| 02/16/1995 | WO1995004878A1 Virtual emissions monitor for automobile |
| 02/16/1995 | CA2167927A1 Virtual emissions monitor for automobile |
| 02/16/1995 | CA2167588A1 Virtual continuous emission monitoring system with sensor validation |
| 02/09/1995 | WO1995003998A1 Water control system using oxidation reduction potential sensing |
| 02/09/1995 | WO1995003997A1 Water control system using oxidation reduction potential sensing |
| 02/02/1995 | WO1995003254A1 Monitoring biological activity in wastewater |
| 01/17/1995 | US5382520 From alkali metal chlorates and chlorides |
| 01/12/1995 | WO1995001591A1 Water control system |
| 01/12/1995 | DE4321994A1 Method for the control of quantities of chemical aids and flocculants as a function of an on-line mass-solids measurement for clarification and dewatering processes of all kinds, and installation for carrying out the method |
| 01/11/1995 | EP0364542B1 An electronic controller for a water purifying unit |
| 01/10/1995 | US5380485 Apparatus for conducting and controlling chemical reactions |
| 12/28/1994 | EP0630202A1 Self-optimizing detergent controller |
| 12/27/1994 | US5376280 Flocculation control system and method |
| 12/20/1994 | US5374380 Salinity control of sump water using conductivity probes |
| 12/08/1994 | WO1994028230A1 Infectious waste treatment system and method |
| 12/06/1994 | US5370743 Determining electroconductivity of solution and converting into concentration by means of given equation |
| 11/29/1994 | US5368699 Method of controlling the concentrations of a multicomponent mixture |
| 11/15/1994 | US5364510 Scheme for bath chemistry measurement and control for improved semiconductor wet processing |
| 11/10/1994 | DE4411185A1 Automatic water-supplying device for a wet-mop cleaning apparatus and a water-supplying method therefor |
| 11/02/1994 | CN1094506A Method of controlling a water quality of recycle cooling water in a cooling tower |
| 10/18/1994 | US5356458 Computerized chemical injection system for hydrogen sulfide control in a waste water stream |
| 10/04/1994 | US5353237 System for increasing efficiency of chemical treatment |
| 10/04/1994 | US5352350 Method for controlling chemical species concentration |
| 09/21/1994 | EP0616171A1 Control method for thermal processes |
| 09/20/1994 | US5348664 Process for disinfecting water by controlling oxidation/reduction potential |
| 09/20/1994 | US5348663 Control of bromination of drinking water |
| 09/15/1994 | DE4312580C1 Small water treatment unit based on ion exchanger with the facility for regeneration and thermal disinfection |
| 08/30/1994 | US5342510 Automatically controlling scale |
| 08/25/1994 | DE4305167A1 Process for fully automatic fermentation process control in the production of alcoholic beverages |
| 07/28/1994 | DE4311423C1 Oil and water emulsion cracking agent dosing control |
| 07/27/1994 | EP0607384A1 Polarographic sensor |
| 07/26/1994 | US5332494 Water control system using oxidation reduction potential sensing |
| 07/21/1994 | WO1994016369A1 METHOD FOR THE CONTINUOUS MEASUREMENT AND ADJUSTMENT OF THE pH OF AN ACIDIC LIQUID, pH MEASUREMENT BEING BY MEANS OF A GLASS ELECTRODE |
| 07/21/1994 | WO1994016323A1 Temperature stabilized fluid calibration system |
| 07/20/1994 | EP0606456A1 Arrangement for continuously monitoring the no concentration in gas mixtures. |
| 07/05/1994 | US5325605 Method and apparatus for waste treatment |
| 06/29/1994 | EP0604236A1 Nitrogen oxide removal control apparatus |
| 06/28/1994 | US5324431 Process for treating suspended substances in liquor |
| 06/14/1994 | US5320748 Acid dispensing system for a swimming pool |
| 05/31/1994 | US5316646 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 05/26/1994 | DE4339225A1 Neutralisation of heating boiler condensate - is achieved by introducing measured dose of liquid or powder into condensate as it passes from heat exchanger to collector |
| 05/05/1994 | DE4236614A1 Analysis and control of microorganism culture - by measuring cloudiness of nutrient to show growth and give control indications |
| 04/26/1994 | US5306409 Controlling apparatus for continuous electrolytic ion water producing apparatus |
| 04/12/1994 | US5302270 Oxygen concentration or humidity controlling apparatus |
| 04/07/1994 | DE4233265A1 Neutralising the pH value of acid water - has control to regulate the neutralising agent feed according to comparison of nominal and actual pH values |
| 03/17/1994 | DE4229803A1 Control of nitriding and nitro:carburising atmospheres - by oxygen probe using fully dissociated gas as reference gas |
| 03/15/1994 | US5294048 Apparatus for controlling ventilation fan |
| 03/09/1994 | EP0585740A1 Method for printing process control on a printing press using halftone photoengraving in particular a sheet offset printing machine |
| 03/09/1994 | EP0585702A1 Bioactivity control device for biological systems |
| 03/03/1994 | WO1994004913A1 Polarographic sensor |
| 02/17/1994 | WO1994003796A1 Arrangement for continuously monitoring the no concentration in gas mixtures |
| 02/17/1994 | WO1994003795A1 Device for the continuous monitoring of the no concentration in gas mixtures |
| 02/17/1994 | DE4226537A1 Polarographischer Sensor Polarographic sensor |
| 02/10/1994 | DE4225775A1 Anordnung zum kontinuierlichen Überwachen der Konzentration von NO in Gasgemischen Arrangement for continuously monitoring the concentration of NO in gas mixtures |