| Patents for C02F 5 - Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (8,632) |
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| 10/28/1993 | WO1993021361A1 Composition and method for scavenging oxygen |
| 10/28/1993 | CA2134106A1 Method of cleaning and maintaining hot water heaters |
| 10/28/1993 | CA2093300A1 Calcium carbonate antiprecipitating agents |
| 10/27/1993 | CN1077731A Composition and method for scavenging oxygen |
| 10/26/1993 | US5256303 Method for inhibiting scale formation and/or dispersing iron in reverse osmosis systems |
| 10/26/1993 | US5256302 Method for controlling silica and water soluble silicate deposition |
| 10/26/1993 | CA1323627C Copolymers of unsaturated carboxylic acids and use thereof |
| 10/26/1993 | CA1323470C Compositions for scale inhibition for kraft digesters |
| 10/21/1993 | DE4212755A1 New sulphonated polyepoxy succinic acids and salts - prepd. by oligomerisation of salt of epoxy] succinic acid in calcium sulphite, used as scale inhibitor and sequestrant |
| 10/20/1993 | CN1077435A Scale removing liquor for aluminium vessel and thermobottle |
| 10/20/1993 | CN1077394A Incrustation removing (acid washing) water purifier for heating boiler |
| 10/19/1993 | US5254286 Composition for controlling scale in black liquor evaporators |
| 10/14/1993 | WO1993020013A1 Water compositions |
| 10/14/1993 | DE4211713A1 New amino di:carboxylic-N,N-di:acetic acid deriv., useful as complexing agents - is prepd. from amino di:carboxylic acids, formaldehyde and hydrocyanic acid, or alkali metal cyanide, with amino di:carboxylic acid-N,N-di:acetonitrile as intermediate |
| 10/14/1993 | CA2110066A1 Water compositions |
| 10/13/1993 | EP0565294A1 Polyether polyamino methylene phosphonate N-oxides for high pH scale control |
| 10/13/1993 | CN1077145A Apparatus for activating silicic acid in water |
| 10/12/1993 | US5252300 In a water recirculation system; ozonating and adjustment of level of calcium bicarbonate |
| 10/06/1993 | EP0564248A1 N-(2-hydroxyethyl)-N-bis(methylenephosphonic acid) and corresponding N-oxide thereof for high pH scale control |
| 10/06/1993 | EP0564232A1 N,N-bis(phosphonomethyl)-2-amino-1-propanol derivatives for high pH scale control |
| 10/06/1993 | EP0563730A2 Alkenylaminoalkylene phosphonic acid esters and process for the preparation of copolymers comprising alkenylaminoalkylene phosphonates and ethylenic unsaturated compounds |
| 10/06/1993 | EP0563729A2 Alkenylaminoalkane-1,1-disphosphonic acid derivatives and its copolymers with unsaturated carboxylic acids |
| 10/05/1993 | US5250183 Degassing, evaporation of carbon dioxide, then reverse osmosis for removal of scale forming ions |
| 10/01/1993 | CA2092492A1 N-(2-hydroxyethyl)-n-bis (methylenephosphonic acid) and corresponding n-oxide thereof for high ph scale control |
| 10/01/1993 | CA2092491A1 Polyether polyamino methylene phosphonate n-oxides for high ph scale control |
| 09/29/1993 | CA2092775A1 Alkenylaminoalkenylenephosphonic esters and process for the preparation of copolymers comprising alkenylaminoalkenylenephosphonates and ethylenically unsaturated compounds |
| 09/29/1993 | CA2092757A1 Alkenylaminoalkane-1,1-diphosphonic acid derivatives and copolymers thereof with unsaturated carboxylic acids |
| 09/28/1993 | US5248438 Methods of controlling scale formation in aqueous systems |
| 09/22/1993 | EP0471711B1 Use of water-soluble copolymerizates obtained from monoethylenically unsaturated carboxylic acids and vinylimidazole (derivatives) as water-softening agents |
| 09/16/1993 | DE4207560A1 Simultaneous removal of carbonate and denitrification of water - using calcium hydroxide as precipitant and biomass, supported on pptd. calcium carbonate, as denitrifying agent |
| 09/14/1993 | US5244988 Maleate polymerization process |
| 09/07/1993 | US5242599 Adding a water soluble polymer and topping agent |
| 09/07/1993 | US5242593 Method for reducing the build-up of slime and/or film in water circulation systems |
| 09/01/1993 | EP0558402A1 Water demineralisation device |
| 08/31/1993 | US5240579 Electrodialysis reversal process and apparatus with bipolar membranes |
| 08/25/1993 | EP0530358A4 Polyaspartic acid as a calcium carbonate and a calcium phosphate inhibitor |
| 08/24/1993 | CA1321673C Low weight acrylamide acrylate copolymer and process to hinder at least partially the formation of salt deposits from aqueous media |
| 08/18/1993 | EP0556162A1 Apparatus for activating silicic acid in water |
| 08/17/1993 | CA1321341C Method of controlling manganese deposition in open recirculating aqueous systems |
| 08/17/1993 | CA1321340C Method of stabilizing manganese in aqueous systems |
| 08/15/1993 | CA2089408A1 Apparatus for activating silicic acid in water |
| 08/10/1993 | US5234602 Method for regenerating scale solvent |
| 08/10/1993 | US5234555 Method and apparatus for ionizing fluids utilizing a capacitive effect |
| 08/10/1993 | US5234466 Forms less corrosive solution than sulfamic acid |
| 08/08/1993 | CA2083560A1 Polymers for the treatment of boiler water |
| 08/04/1993 | EP0554074A1 Control of scale and hardness |
| 08/04/1993 | EP0553149A1 Apparatus and method for hydrolysis of cyanide-containing liquids. |
| 08/03/1993 | US5232629 Reducing solubility of lead parts in drinking water supply systems by adding trisodium phosphate and sodium silicates in controlled amounts |
| 08/03/1993 | US5232603 Use of water-soluble copolymers of monoethylenically unsaturated carboxylic acids and vinylimidazoles or derivatives thereof for water treatment |
| 08/03/1993 | CA1321043C Water soluble phosphonated polymers |
| 07/29/1993 | CA2083453A1 Methods of controlling scale formation in aqueous systems |
| 07/28/1993 | EP0429631B1 Biocidal methods for recirculating water systems |
| 07/22/1993 | DE4200916A1 Partial decarbonisation of water esp. drinking water - by trickling water through filter and simultaneously lowering pressure to backwash filter and flowing carbon di:oxide-free inert gas through filter |
| 07/20/1993 | US5229029 Terpolymers or maleic anhydride, vinyl acetate, third monomer, laundry detergents |
| 07/14/1993 | CN1074199A Circulating sludge method for integrating water supply with drainage channels |
| 07/06/1993 | US5225086 Process for the treatment of wash water from the gas washing system of an iron ore reduction plant |
| 06/29/1993 | US5223146 Dispersion of iron (III) oxides using certain dihydroxaromatic compounds |
| 06/23/1993 | CN1073415A Method for treating circulatory water of blast furnace |
| 06/22/1993 | US5221487 Inhibition of scale formation and corrosion by sulfonated organophosphonates |
| 06/09/1993 | CN1072989A Underground petroleum-containing formations and equipment associated therewith |
| 06/08/1993 | CA1318986C Inhibition of mineral deposition by polyanionic/hydrophobic peptides and derivatives thereof |
| 06/02/1993 | EP0544345A1 Corrosion and/or scale inhibition |
| 05/26/1993 | EP0543473A1 Method of dispersing iron |
| 05/25/1993 | US5213691 Phosphonate-containing polymers for controlling scale in underground petroleum-containing formations and equipment associated therewith |
| 05/12/1993 | EP0541318A1 Cooling water treatment composition and method |
| 05/12/1993 | EP0541317A1 A method of scavenging oxygen from boiler waters with substituted quinolines |
| 05/07/1993 | CA2082234A1 Method of scavenging oxygen from boiler waters with substituted quinolines |
| 05/07/1993 | CA2055061A1 Cooling water treatment composition |
| 05/04/1993 | US5207919 Copper Complex of Ethylenediaminetetrakis/methylenephosphonic Acid/ |
| 04/29/1993 | WO1993008131A1 Method for removing calcium sulfate scale |
| 04/28/1993 | EP0539171A2 Method for monitoring fouling in commercial waters |
| 04/28/1993 | EP0538969A2 Composition and method for inhibiting scale and corrosion using naphthylamine polycarboxylic acids |
| 04/28/1993 | CN1071397A Magnetic descaling device |
| 04/25/1993 | CA2074609A1 Inhibition of scale formation by polyepoxysuccinic acid |
| 04/25/1993 | CA2074336A1 Inhibition of scale formation and corrosion by sulfonated organophosphonates |
| 04/25/1993 | CA2074335A1 Naphthylamine polycarboxylic acids |
| 04/21/1993 | EP0538026A1 Method for controlling calcium sulfate scaling in metal mining circuits |
| 04/16/1993 | CA2053807A1 Biocidal compositions and use thereof containing a synergistic mixture of 3-iodo-2-propynyl-butyl carbamate and 2-n-octyl-4-isothiazolin-3-one |
| 04/15/1993 | WO1993007087A1 Hardness suppression in urea solutions |
| 04/14/1993 | EP0536908A1 Method of improving city water and an apparatus therefor |
| 04/10/1993 | CA2073658A1 Dispersion of iron (iii) oxides using certain dihydroxyaromatic compounds |
| 04/07/1993 | EP0256057B1 Scale inhibitor |
| 04/06/1993 | US5200117 Composition of polyaminopolycarboxylic acid or salt chelating agent, synergist-catalyst of monocarboxy acid anion |
| 04/06/1993 | US5200105 Scale control in aqueous systems |
| 04/06/1993 | US5199995 Compounds for removing iron rust scales from water pipes and method therefor |
| 04/01/1993 | WO1993006047A1 Method for regenerating scale solvent |
| 04/01/1993 | DE4131912A1 Biodegradable carboxy-alkane-aminomethane-phosphonic acid mixt. used as metal ion chelating agent - consists of amino:bis(methylene phosphonic) acids and small amts. of amino:mono(methylene phosphonic) acids |
| 04/01/1993 | CA2119455A1 Method and apparatus for treating water and/or wastewater |
| 03/31/1993 | EP0534692A1 Corrosion inhibitor combinations and process for inhibiting corrosion in heat transfer fluids |
| 03/18/1993 | WO1993004987A1 Hypochlorite donor/bromide ion donor tablets which are stable in water |
| 03/10/1993 | EP0530358A1 Polyaspartic acid as a calcium carbonate and a calcium phosphate inhibitor. |
| 03/09/1993 | US5192447 Use of molybdate as a cooling water corrosion inhibitor at higher temperatures |
| 03/09/1993 | CA1314357C Water treatment polymer |
| 03/04/1993 | WO1993004006A1 No drain acid treatment of pools |
| 03/03/1993 | CN1019989C Method for improving performance of corrosion inhibitors in industrial colling waters |
| 03/02/1993 | US5191048 Biodegradable free-radical addition polymers |
| 03/02/1993 | US5190728 Sampling, adding oxygen and analyzing for dissolved oxygen and recording for water analysis |
| 03/02/1993 | US5190664 Preventing fouling caused by high temperature geothermal brines, adding sulfuric acid to brine |
| 03/02/1993 | US5190656 Method for removing scale via a liquid membrane in combination with an amino carboxylic acid and a catalyst |
| 02/24/1993 | EP0527908A1 New formulations for iron oxides dissolution |