Patents
Patents for C02F 5 - Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (8,632)
12/1981
12/01/1981US4303568 Corrosion inhibition treatments and method
12/01/1981US4303546 Process of treating aqueous heating media in heating systems, and composition
11/1981
11/24/1981US4302350 Method and composition to inhibit staining of porcelain surfaces by manganese
11/24/1981CA1113007A1 Fluoride and stannous salt in acidic oral composition
11/17/1981USRE30796 Scale removal, ferrous metal passivation and compositions therefor
11/17/1981CA1112664A1 N-carboxyalkane-aminoalkane polyphosphonic acids and their alkali salts and a process for producing same
11/17/1981CA1112663A1 N-sulphoalkane-aminoalkane phosphonic acids and their alkali salts and process for their production
11/04/1981EP0039033A1 Process for preparing omega-amino-1-hydroxyalkylidene-1, 1-bis phosphonic acids
11/03/1981US4298568 3-amino-5-alkyl-1,2,4-triazole
10/1981
10/27/1981US4297293 Sodium alumoglucoheptonate and a process for its preparation
09/1981
09/15/1981US4289639 Method and composition for removing sulfide-containing scale from metal surfaces
09/08/1981US4288342 Sodium silicate, aluminosilicate and phosphate, (bi)carbonate, sulfate or tetraborate solubilizer
09/08/1981US4288340 Granulated composition comprising a polymer phosphate and an alkali metal aluminum silicate, process of making and method of using same
09/08/1981US4288327 Sulfonated styrene-maleic anhydride copolymer
09/01/1981CA1107948A1 Corrosion inhibiting compositions and process of using same
08/1981
08/18/1981US4284513 Process for preventing encrustations on surfaces which are in constant contact with aqueous solutions containing matter prone to crystallize
08/12/1981EP0033557A1 A method and apparatus for testing the effectiveness of chemicals such as scale inhibitors or scale removers
08/12/1981EP0033417A1 Method of and composition for inhibiting corrosion
08/11/1981US4283300 Method and composition to inhibit staining of porcelain surfaces by manganese
08/11/1981CA1106843A1 N-carboxy-alkane-aminoalkane-diphosphonic acids, n- carboxy-alkane-azacycloalkane-diphosphonic acids and n-carboxy-alkane-aminoaryl-alkane-diphosphonic acids and process for theirproduction
08/04/1981CA1106357A1 Process for the cleaning of fouled heat exchangers and other equipment
07/1981
07/22/1981EP0032416A2 Descaling process
07/21/1981US4279768 Synergistic blend of ghelant, polyacrylamide conditioner and a gluconate
07/21/1981US4279758 Lqundering or dishwashing water treatment
07/15/1981EP0032041A2 Use of fumaric acid polymers as antiscalants, and processes for their preparation; polymeric intermediates of mono or dialkyl fumarate, and processes for their production
07/14/1981US4278605 Antitumor agents
07/07/1981US4277359 Water treatment to inhibit corrosion and scale and process
07/07/1981US4277343 Method for continuously monitoring and controlling alkalinity for environmental purposes using a pCO2 probe
06/1981
06/23/1981US4275010 Antitumor, chelation
06/02/1981US4271058 Anionic polymer containing ammonium functional groups, water treatments
05/1981
05/27/1981EP0029076A1 Method of controlling deposition in aqueous systems
05/12/1981US4267108 Hydroxyalkane diphosphonic acids
05/12/1981CA1100995A1 N-sulphoalkane-aminoalkane phosphonic acids and their alkali salts and process for their production
05/06/1981EP0027877A1 5,8-dihydroxy-1,4-bis(guanidinyl-amino)anthraquinones
05/05/1981US4265769 Method of treating aqueous systems with phosphonoadipic acids
04/1981
04/28/1981US4264768 Di-quaternary ammonium salts of α-1,4-thiazine alkanephosphonic acids
04/28/1981US4264767 α-1,4-Thiazine alkanephosphonic acids
04/14/1981CA1099275A1 Process for the manufacture of polymaleic anhydride
04/07/1981US4260504 Polyoxyalkylene triol additives for minimizing deposits from aqueous heat-exchanging fluids
04/01/1981EP0025863A1 Use of 1,2,4-triazole derivatives as corrosion inhibitors for non ferrous metals
03/1981
03/31/1981US4259483 Quaternary ammonium salts of α-1,4-thiazine alkanephosphonic acids
03/17/1981US4256660 Reacting n-methylol- (meth-)acrylamide with sulfonated n-methylol-acrylamide
03/17/1981US4256556 Anodically polarized surface for biofouling and scale control
03/10/1981US4255572 Reacting formic acid, phosphorus trichloride, and an n,n'-dialkylurea, water treatment agents
03/10/1981US4255309 Using polyacrylic acid or polysodium acrylate in a blend to prevent precipitation in black liquor of the kraft process
03/10/1981US4255259 Sulfonated maleic acid or anhydride-styrene copolymer and an organic phosphonic acid, boiler water systems
03/03/1981US4253969 Iron hydroxide
03/03/1981US4253968 Process of inhibiting precipitation of calcium salts utilizing a copolymer of allyl monomers and maleic anhydride
03/03/1981US4253950 Method for cleaning water containing devices
03/03/1981US4253912 High chlorine resistance, calcium tolerance
02/1981
02/25/1981EP0024247A1 Composition and method for the control of scale and deposits in gas-liquid separations
02/17/1981CA1095691A1 Process for converting waste dead-burned magnesium oxide-containing material into useful product
02/03/1981CA1094792A1 Anti-corrosion composition for use in aqueous systems
01/1981
01/27/1981US4247371 Precipitating scale-forming compounds from water, and forming fresh water
01/27/1981CA1094424A1 Granulate based on polymer phosphate and alkali aluminum silicate
01/20/1981US4246103 Inhibit precipitation of hard water ions especially for industrial water and sludge
01/20/1981US4246030 Amino alkylene phosphonic acid or its derivative
01/06/1981US4243591 Poly(vinyl phosphonomethylene amino carboxylates) and process for preparation
01/06/1981US4243524 Aminoalkylenephosphonic acids and salts thereof and their use in aqueous systems
12/1980
12/23/1980CA1092052A1 Process for separating ammonia and acid gases from waste waters containing fixed ammonia salts
12/23/1980CA1092051A1 Process for separating ammonia and acid gases from waste waters containing fixed ammonia salts
12/16/1980US4239648 Telomeric phosphorus corrosion inhibiting compositions
12/02/1980US4237090 By adding tolyltriazole, bactericide, sodium metasilicate, sodium nitrite, and borax
12/02/1980CA1090818A1 2,2,2-tris (hydroxymethyl) ethylphosphonic acid and method for its preparation
11/1980
11/25/1980US4235856 Method of producing a zeolite of controlled particle size
11/25/1980US4235698 Electronic water treatment apparatus
11/18/1980US4234511 Dialkylamino-N,N-bis(phosphonoalkylene)alkylamines and use in aqueous systems as precipitation and corrosion inhibitors
11/11/1980CA1089315A1 Synergistic compositions for corrosion and scale control
10/1980
10/29/1980EP0018344A1 Method and composition to inhibit staining of porcelain surfaces by manganese, and toilet tank dispenser using this composition
10/21/1980US4229294 Hydroxypropylene-amino-phosphonic-sulfonic acids for inhibiting scale formation
10/21/1980CA1087957A1 Method of inhibiting deposition of scale from water
10/14/1980CA1087480A1 Gas scrubber scale and deposit control
09/1980
09/23/1980US4224149 Precipitant or sequestrant for calcium ions
09/16/1980US4223120 Terpolymers of maleic anhydride and their use as scale control agents
09/03/1980EP0014939A2 Sodium alumoglucoheptonate, a process for its preparation and its use as sequestering agent
09/02/1980US4220661 Preservative composition
08/1980
08/26/1980US4219672 Ether carboxylic acids
08/19/1980CA1083916A1 Particulate composition
08/05/1980US4216163 N-Sulfo alkane amino alkane phosphoric acids and their alkali metal salts, and a process of producing same
08/05/1980US4216087 Sodium hydroxide, n-/2-hydroxyethyl/iminodiacetic acid
07/1980
07/15/1980US4212788 Process for producing polymaleic anhydride
07/15/1980US4212734 Inhibiting scale with amino-phosphonic-sulfonic acids
07/08/1980CA1081255A1 Stable substituted acrylamides or methacrylamides
07/08/1980CA1081096A1 Passivating metal surfaces
07/01/1980CA1080578A1 Surfactant dispersion of biological slimes
07/01/1980CA1080577A1 Compositions for the inhibition of scale deposits in aquous systems
06/1980
06/25/1980EP0012508A2 Process for the cleaning of fouled heat exchangers and other process equipment
06/24/1980US4209398 Antiscaling and antideposit agents; acrylic polymers, phosphorus compounds, metal salts
06/17/1980CA1079604A1 Polymers for use in water treatment
06/11/1980EP0012000A1 Prevention of deposits on metal surfaces
06/11/1980EP0011743A1 Means for preventing scale deposit formation in the evaporation of sugar juices, a process for the evaporation of sugar juices and application of the means thereto
05/1980
05/27/1980US4205143 Acrylic acid polymer and polydimethyldiallylammonium chloride
05/27/1980US4204953 Process for alkaline scaling
05/06/1980US4201688 Diethylenetriaminopenta(methylenephosphonic acid) and aminotri7methylenephosphonic acid) or their alkali metal salts
05/06/1980US4201669 Deposit control through the use of oligomeric phosphonic acid derivatives
04/1980
04/30/1980EP0010147A1 N,N'-dialkyl-ureidomethane-diphosphonic acid, its preparation and use
04/29/1980US4200500 Method of preventing the adhesion of scale to the heating surfaces of a thermal desalination apparatus
04/15/1980CA1075637A1 Electrostatic water treatment
04/02/1980EP0009304A1 Process for inhibiting scaling in evaporative desalination units
04/02/1980EP0009080A1 Corrosion inhibitors; compositions for protecting ferrous metals and the protected metals
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