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| Number | Title | Issue Date |
| 4035412 | Methylene phosphonates of poly-diepoxidized polyalkylene polyamines Methylene phosphonates of poly-diepoxidized polyalkylene polyamines and to uses therefor, particularly as scale inhibitors, chelating agents, etc.... | 07/12/1977 |
| 4029697 | N-acyl-1-amino alkane-1,1-diphosphonic acid compounds, process of making same, and compositions for and method of using same N-acyl-1-amino alkane-1,1-diphosphonic acids or their alkali metal salts are highly effective scale and deposit formation preventing, metal ion complexing, sequestering, and anti-corrosive agents which can be used with great advantage in washing and clean... | 06/14/1977 |
| 4029696 | N-hydroxy alkane amino alkane diphosphonic acids, process of producing same, and compositions for and method of using same Valuable amino alkane diphosphonic acids in which one or both hydrogen atoms of the amino group are substituted by hydroxy alkane groups, and their alkali metal salts and a process of making them are described. Said compounds are highly water-soluble, are... | 06/14/1977 |
| 4026815 | Method for preventing corrosion in water-carrying systems In the inhibition of corrosion and scale formation in a water-carrying system wherein to the water there is added a phosphonocarboxylic acid of the formula ##STR1## in which R is hydrogen, an alkyl, alkenyl or alkinyl radical having up to 4 carb... | 05/31/1977 |
| 4020091 | Chelation Tin salts of polyphosphonic acids, e.g., stannous salts of ethane hydroxy diphosphonic acid and methane phenyl hydroxy diphosphonic acid are prepared.... | 04/26/1977 |
| 4012440 | Methylene phosphonates of oxyalkylated polyalkylene polyamines and uses therefor Methylene phosphonates of oxyalkylated polyalkylene polyamines having at least three nitrogen atoms wherein there are nitrogen-bonded methylene phosphonate units of the formula --CH2 PO(OM)2. These compounds are used as scale inhibit... | 03/15/1977 |
| 4011171 | Boiler treatment using amines and organophosphonate materials A method of inhibiting the precipitation of scale deposits in water systems using a scale preventive composition which consists of a combination of an organophosphonate material and an amine selected from the group consisting of dihydroxyethylethylenediam... | 03/08/1977 |
| 3992294 | Process for sequestering metal ions A process is disclosed for sequestering metal ions by treating said ions with a compound of the formula: ##EQU1## wherein R' is selected from the group consisting of -OH, alkyloxy and aryloxy; and R is selected from the group consisting of... | 11/16/1976 |
| 3985671 | Scale control agents A synergistic blend of a polyaminoalkylenephosphonate and a polyquaternary ammonium chloride compound is used as a scale control agent for recirculating water cooling equipment.... | 10/12/1976 |
| 3974209 | Substituted tertiary amines and processes for preparing the same Substituted tertiary amines of the general formula ##EQU1## wherein R1, R2, R3, R4, R5, X and Y are hereinafter defined and n is 1 - 20, and which are found useful as agents for complexing metal ... | 08/10/1976 |
| 3969260 | Corrosive inhibitor compositions A synergistic mixture comprising an alkynyl cycloalkanol and N,N'-dicycloalkyl-thiourea and polyaminomethylenephosphonate is used as an inhibitor in protecting metals from acid attack when cleaning said metals with an acid solution.... | 07/13/1976 |
| 3966630 | Use of polyquaternary ammonium methylene phosphonates in chelating or scale inhibition Polyquaternary ammonium methylene phosphonates and uses thereof, particularly as scale inhibitors, chelating agents, bactericides, etc.... | 06/29/1976 |
| 3965003 | Scale inhibition and compounds therefor Phosphated oxypropylated hydroxy hydrocarbons obtained by reacting polyphosphoric acid or phosphorus pentoxide or mixtures thereof with oxypropylated hydroxy hydrocarbons, with or without neutralization, are used as scale inhibitors for calcium, barium an... | 06/22/1976 |
| 3958635 | Method of inhibiting scale for high temperature steam wells A method of inhibiting the formation of scale from aqueous solutions containing scale-forming ions at temperatures of 400° F. and above during production and utilization of such aqueous solutions comprising adding to the solutions certain substituted imi... | 05/25/1976 |
| 3959168 | Synergistic sequestering agent compositions A synergistic sequestering agent composition comprising (a) 1-hydroxyethane-1,1-diphosphonic acid and its alkali metal and ammonium salts, or, preferably and (b) aminotrimethylenephosphonic acid and its alkali metal and ammonium salts, as well as (c) a ph... | 05/25/1976 |
| 3957160 | Process for the prevention of precipitations in water or aqueous solutions The invention relates to a process for the prevention of inorganic salt precipitations in water or aqueous solutions by the additions to the solutions of small amounts of N-substituted aminoalkane-1,1-diphosphonic acids or their alkali metal salts or ammo... | 05/18/1976 |
| 3954761 | Piperazine phosphonic acids Nitrogen-heterocyclic phosphonic acids and derivatives thereof characterized by aminomethyl (or substituted methyl) phosphonic acids or derivatives thereof bonded directly or indirectly, i.e., through a N-side chain to the nitrogen atom in the heterocycli... | 05/04/1976 |
| 3948792 | Corrosion and scale softening composition A method and composition for reducing the amount of and softening silicate scale formation in automobile and diesel coolant systems where a silicate containing anti-corrosion formula is used which comprises adding to said formula an effective amount of a ... | 04/06/1976 |
| 3940436 | Substituted ethane diphosphonic acids and salts and esters thereof New and useful substituted ethane diphosphonic acids and salts thereof as exemplified by the compound having the formula ##EQU1## 2-amino-1-hydroxyethane-1,1-diphosphonic acid and processes for preparing the same which generically comprise the "de-ox... | 02/24/1976 |
| 3932303 | Corrosion inhibition with triethanolamine phosphate ester compositions Use of alkanolamine phosphate ester and at least one member selected from the group consisting of phosphates, phosphonates, and low molecular weight polymers to inhibit the corrosion of metals by oxygen-bearing waters.... | 01/13/1976 |
