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| Number | Title | Issue Date |
| 4659480 | Water treatment polymers and methods of use thereof Scale control polymers and methods of use are disclosed. The polymers are water soluble and are composed of repeat units formed from an , 댮thylenically unsaturated commpound, and repeat units formed from allyl alkylene phosphite ethers.... | 04/21/1987 |
| 4640793 | Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers The instant invention is directed to an admixture, and its use in inhibiting scale and corrosion in aqueous systems, comprising: (a) a water-soluble polymer having a weight average molecular weight of less than 25,000, as determined by low angle laser light sc... | 02/03/1987 |
| 4634532 | Orthophosphate-containing desalination scale inhibitors The instant invention is directed to a process for the control of scale formation and deposition in thermal or reverse osmosis membrane desalination plants, comprising adding to the water 0.1 to 100 ppm of (a) a water soluble orthophosphate and (b) at lea... | 01/06/1987 |
| 4631131 | Method for inhibiting scale The accumulation of scale in an aqueous system is inhibited by the addition of a copolymer of maleic acid or anhydride or fumaric acid and allyl sulfonic acid and a water soluble organic phosphonic acid such as aminotri(methylene phosphonic acid), ethylen... | 12/23/1986 |
| 4584104 | Silica inhibition: prevention of silica deposition by boric acid/orthorborate ion A method of inhibiting amorphous silica scale formation on surfaces in contact with industrial waters containing dissolved silicates is disclosed. The method involves treating the industrial waters with a boron compound which dissolves in or hydrolyzes in... | 04/22/1986 |
| 4575425 | Process for controlling calcium oxalate scale over a wide pH range The instant invention is directed to a composition useful for inhibiting precipitation of calcium oxalate in aqueous systems comprising: (a) a water soluble phosphate, phosphonate or phosphinate; and (b) a water soluble polyelectrolyte wherein the ratio o... | 03/11/1986 |
| 4561981 | Treatment of fouling with microcapsules A method for controlling, preventing, or removing fouling deposits comprising microencapsulating fouling control chemicals in a slow release capsule. The microcapsules are applied to the substrate to be treated, where they stick to the substrate and slowl... | 12/31/1985 |
| 4560481 | Method of controlling iron induced fouling in water systems A method of inhibiting corrosion and controlling deposition in aqueous mediums, such as in cooling water systems, wherein iron containing well water is used as a water make-up source, is disclosed. The method comprises addition of certain water soluble ac... | 12/24/1985 |
| 4552665 | Stabilization of soluble manganese and its reaction products The instant invention is directed to a process for inhibiting the precipitation of dissolved manganese ion and its reaction products in aqueous solutions, comprising adding to the aqueous solution 0.1 to 20 ppm of a copolymer of an unsaturated carboxylic ... | 11/12/1985 |
| 4548787 | Aqueous liquids containing metal cavitation-erosion corrosion inhibitors Compositions for inhibiting mineral scale and the corrosion of metals particularly the cavitation corrosion of aluminum in the presence of aqueous liquids are disclosed. The combination of a water-soluble phosphate with at least one of a water-soluble mol... | 10/22/1985 |
| 4547294 | Alkaline scale abatement in cooling towers Formation of alkaline scale on cooling tower and associated heat transfer surfaces contacted by circulating water is reduced or substantially eliminated while minimizing equipment corrosion by introducing an effective amount of carbon dioxide and a thresh... | 10/15/1985 |
| 4534866 | Deposit control method A water system deposit control method and composition of high calcium tolerance are herein disclosed. The composition comprises a reaction product formed from acrylic acid, hydroxylated lower alkyl acrylate and hypophosphorous acid. In accordance with the... | 08/13/1985 |
| 4502978 | Method of improving inhibitor efficiency in hard waters A method of enhancing corrosion inhibition of inorganic corrosion inhibitors, particularly stabilized phosphate corrosion inhibitors, when used in high hardness waters containing at least 800 ppm total hardness which comprises adding to the high hardness ... | 03/05/1985 |
| 4452713 | Inhibition of the staining of porcelain surfaces by manganese Method, composition and article of manufacture to inhibit the staining of water-contacting surfaces, such as those in a toilet bowl, which is caused by manganese present in household water in the presence of an oxidizing material. Manganese staining is in... | 06/05/1984 |
| 4446028 | Isopropenyl phosphonic acid copolymers used to inhibit scale formation A water soluble isopropenylphosphonic acid copolymer composition and method of use thereof are disclosed. The copolymer comprises repeat units (a) of the formula ##STR1## wherein X=OH or OM, wherein M is a cation; and repeat units (b) of the for... | 05/01/1984 |
| 4444675 | Alkaline scale abatement Formation of alkaline scale in water distillation equipment is reduced or substantially eliminated without a significant increase in equipment corrosion rate by dissolving an effective amount of carbon dioxide in brine which is boiling or flashed or which... | 04/24/1984 |
| 4443340 | Control of iron induced fouling in water systems A method for inhibiting corrosion and controlling deposition in an iron containing aqueous medium is disclosed. The method is capable of providing for the formation of a protective passive oxide film on the metallic surfaces in contact with the aqueous me... | 04/17/1984 |
| 4442009 | Boiler water treatment The present invention is directed to a method for controlling scale which would otherwise be formed from water-soluble calcium, magnesium and iron impurities contained in boiler water which would provide calcium, magnesium and iron ions. The method compri... | 04/10/1984 |
| 4440792 | Method for preventing gelation of corn steep liquor The "livering" or gelling of corn steep liquor or liquid products containing corn steep liquor is prevented or reversed by the addition of an effective amount of a calcium complexing agent, preferably at a pH of less than about 3.8.... | 04/03/1984 |
| 4440721 | Aqueous liquids containing metal cavitation-erosion corrosion inhibitors Compositions for inhibiting mineral scale and the corrosion of metals particularly the cavitation corrosion of aluminum in the presence of aqueous liquids are disclosed. The combination of a water-soluble phosphate with at least one of a water-soluble mol... | 04/03/1984 |
| 4436628 | Polyphosphoric acid as a scale and corrosion inhibitor The instant invention is directed to a process for the inhibition of scale and corrosion formation in an aqueous system, comprising adding to the system about 0.1 to 100 ppm, by weight based on the total aqueous content of said system, of 103 to 115% poly... | 03/13/1984 |
| 4401587 | Aminomethylphosphonic acid and polymaleic anhydride combinations for treating corrosion A method of inhibiting corrosion of low carbon steel in an aqueous system comprising treating said system with 1.0 to 300 parts per million by weight of the total aqueous content of said system, of a composition comprising aminomethylphosphonic acid compo... | 08/30/1983 |
| 4388194 | Hydrogen sulfide abatement in geothermal steam systems A method of preventing sludge deposition in the treatment of geothermal steam condensate with iron catalyzed/hydrogen peroxide by carrying out the treatment in the presence of an inorganic polyphosphate.... | 06/14/1983 |
| 4387027 | Control of iron induced fouling in water systems A method for inhibiting corrosion and controlling deposition in an iron containing aqueous medium is disclosed. The method is capable of providing for the formation of a protective passive oxide film on the metallic surfaces in contact with the aqueous me... | 06/07/1983 |
| 4384979 | Corrosion inhibitor The waters used for cooling generally contain hard ions of the group consisting of calcium and magnesium ions concentration of from about 10 to 600 parts per million. Such waters also contain bicarbonate ions. When cooling waters are recirculated through ... | 05/24/1983 |
| 4328180 | Cooling water corrosion inhibitor The waters used for cooling generally contain hard ions of the group consisting of calcium and magnesium ions concentration of from about 10 to 600 parts per million. Such waters also contain bicarbonate ions. When cooling waters are recirculated through ... | 05/04/1982 |
| 4297237 | Polyphosphate and polymaleic anhydride combination for treating corrosion A method of inhibiting corrosion in an aqueous system comprising treating said system with 1.0 to 300 parts per million by weight of the total aqueous content of said system, of a composition comprising polyphosphate and polymaleic anhydride or amine addu... | 10/27/1981 |
| 4176059 | Anti-corrosion composition for use in aqueous systems A low toxicity, corrosion and scale inhibiting composition for use in recirculating aqueous systems, e.g. in heat exchangers, comprises from about 3-1,000 parts by weight of molybdate, from about 0.5-1,000 parts by weight of an organic cationic or non-ion... | 11/27/1979 |
| 4172032 | Polyphosphate-based industrial cooling water treatment When a specific condensed phosphate glass is combined with an organic phosphate ester, an improved composition is afforded for preventing scale and corrosion in industrial cooling systems. Optionally, certain azoles are combined with the phosphate glass a... | 10/23/1979 |
