| Patents for G05D 21 - Control of chemical or physico-chemical variables, e.g. ph-value (1,435) |
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| 12/12/1978 | US4129381 Apparatus and method for preparing a particle suspension |
| 10/31/1978 | US4123341 Apparatus and process for treating contaminated water |
| 10/24/1978 | US4121767 Mobile agricultural sprayer with additive concentration control |
| 10/24/1978 | CA1040841A1 Method of and system for controlling a chemical process |
| 10/10/1978 | US4119520 Water supply system |
| 09/26/1978 | US4116834 Apparatus for increasing the pH of waste water |
| 09/26/1978 | CA1039344A1 Thermally insensitive particle concentration controller |
| 07/11/1978 | US4099871 Method and apparatus for determination of activated sludge volume index |
| 06/20/1978 | US4096028 Feed forward control of dissolved solids in a countercurrent separation and washing zone |
| 06/06/1978 | US4093705 Control of carbon black production |
| 06/06/1978 | US4093551 Device for purifying sewer water in small sewer systems |
| 05/30/1978 | US4091834 Apparatus for automatically preparing solution of controlled concentration |
| 05/30/1978 | US4091833 Device for detecting predetermined foaming conditions in fluids |
| 05/23/1978 | US4091462 Control apparatus for mortar compounding apparatus |
| 04/04/1978 | US4082667 For mixing dialysate in artificial kidney machine |
| 04/04/1978 | US4082666 For water demineralizer |
| 01/31/1978 | US4071443 Regulating oxygen input in treatment of effluent |
| 01/17/1978 | US4068677 Process control circuit for metal-depositing baths |
| 01/10/1978 | US4068162 Rinse tank control system |
| 01/03/1978 | US4066092 Apparatus to regulate the pH value or other similar values of a solution |
| 12/06/1977 | US4061570 Iodine generator for reclaimed water purification |
| 10/25/1977 | US4055751 Process control system for the automatic analysis and regeneration of galvanic baths |
| 10/11/1977 | US4053743 Method for controlling the ph and other concentration variables |
| 09/13/1977 | US4047904 Control systems for adsorber units |
| 08/30/1977 | US4045721 Electro-chemical concentration transducer and its use to measure and control acid strength and storage battery charge |
| 07/05/1977 | US4033871 Integrated monitor and control system for continuously monitoring and controlling pH and free halogen in swimming pool water |
| 06/28/1977 | US4031912 Reactants addition and concentration control system |
| 05/24/1977 | US4024883 Flow additive suspension system |
| 03/22/1977 | US4013039 Wet processing PH control |
| 01/18/1977 | US4003396 Proportional control closed circuit gas admission system |
| 10/26/1976 | US3987808 Metering system |
| 06/08/1976 | US3962029 Method of controlling the amount of chemicals in liquids used within the cellulose industry and related industries |
| 05/04/1976 | US3954119 System for measuring and controlling the concentration of an emulsion |
| 04/13/1976 | US3950155 Automatic air-purifying system |
| 03/23/1976 | US3945904 Coulometric titrators, flue gases, oxygen, hydrogen sulfide, sulfur dioxide |