Patents Assigned to Dearborn Chemical Company
  • Patent number: 5246548
    Abstract: A method for the control of pitch in paper making machine dryer fabrics or equipment which are not in continuous contact with process water comprising applying to the fabrics or equipment, a water-soluble or water-dispersible cationic polymer and a water-soluble or water dispersible anionic aromatic polymer.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: September 21, 1993
    Assignee: Dearborn Chemical Company Limited
    Inventors: David A. Aston, John K. Hochu
  • Patent number: 4995944
    Abstract: A method is disclosed for treating papermill felts to inhibit the deposit of sticky material thereon. The method comprises applying an aqueous solution which contains at least about 2 ppm of a cationic polymer; which contains a water soluble cationic surfactant; the surfactant being applied in an amount effective to inhibit build-up of deposits derived from the cationic polymer. Cationic surfactants are preferred. Particular use is disclosed of water soluble surfactants which have a molecular weight between about 200 and 800 and having the general formula: ##STR1## wherein each R is independently selected from the group consisting of hydrogen, polyethylene oxide groups, polypropylene oxide groups, alkyl groups having between about 1 and 22 carbon atoms, aryl groups, and aralkyl groups, at least one of said R groups being an alkyl group having at least about 8 carbon atoms, and wherein X.sup.- is an anion, or 1/n of an n-valent anion.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: February 26, 1991
    Assignee: Dearborn Chemical Company Ltd.
    Inventors: David A. Aston, Stewart N. Paul
  • Patent number: 4810405
    Abstract: Iron oxide deposits are removed from substrates by use of aqueous solution at approximately neutral pH containing a phosphonate (e.g., hydroxyethylidene diphosphonic acid), a reducing agent (e.g., sodium sulfite), and a corrosion inhibitor (e.g., benzotriazole). Optionally, a surfactant and dispersant may be included.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: March 7, 1989
    Assignee: Dearborn Chemical Company, Limited
    Inventors: John E. Waller, John A. Gray, David A. Aston
  • Patent number: 4781839
    Abstract: Methods are described for flocculating and removing solids suspended in water using an inorganic component containing iron, aluminum, or a mixture thereof in combination with a tannin-based flocculant produced by reacting a condensed tannin with an amino compound and an aldehyde. The tannin-based flocculant is preferably the product of a controlled reaction in which the viscosity is monitored as an indication of suitable shelf life.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: November 1, 1988
    Assignee: Dearborn Chemical Company, Limited
    Inventors: David W. Kelly, Stewart N. Paul, John E. Waller
  • Patent number: 4734216
    Abstract: A composition and method are described for flocculating and removing solids suspended in water using an inorganic component containing iron, aluminum, or a mixture thereof in combination with a tannin-based flocculant produced by reacting a condensed tannin with an amino compound and an aldehyde. The tannin-based flocculant is preferably the product of a controlled reaction in which the viscosity is monitored as an indication of suitable shelf life.
    Type: Grant
    Filed: August 19, 1986
    Date of Patent: March 29, 1988
    Assignee: Dearborn Chemical Company, Limited
    Inventors: David W. Kelly, Stewart N. Paul, John E. Waller
  • Patent number: 4626411
    Abstract: A composition containing a hydroxylamine compound; a quinone, a dihydroxybenzene, a diaminobenzene, or an aminohydroxybenzene compound; and a neutralizing amine is an excellent oxygen scavenger and corrosion inhibitor in boiler water and other aqueous systems.
    Type: Grant
    Filed: April 17, 1985
    Date of Patent: December 2, 1986
    Assignee: Dearborn Chemical Company, Limited
    Inventors: John J. Nemes, Harvey W. Thompson, John E. Waller
  • Patent number: 4588519
    Abstract: A process for inhibiting the corrosion of iron based metals in contact with aqueous systems by incorporating in the aqueous system an effective amount of a composition comprising an inorganic phosphate and a water soluble organic copolymer of acrylamido-sulfonic acid monomers with vinyl carboxylic acid monomers.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: May 13, 1986
    Assignee: Dearborn Chemical Company
    Inventor: Vincent R. Kuhn
  • Patent number: 4581145
    Abstract: The accumulation of scale in an aqueous system is inhibited by the addition of a composition comprising a copolymer of maleic acid or anhydride and vinyl sulfonic acid and an organic phosphonate such as aminotri(methylene phosphonic acid), hydroxyethylidene diphosphonic acid, or a water soluble salt thereof.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: April 8, 1986
    Assignee: Dearborn Chemical Company
    Inventors: Dionisio G. Cuisia, Chih M. Hwa, Anne H. Kemp
  • Patent number: 4558080
    Abstract: An aqueous flocculant solution containing a tannin based polymer compound is produced which is stable and has a shelf life of at least 3-6 months before gelling. The solution is made by reacting at a temperature of from 150.degree.-200.degree. F. a tannin, an amino compound, and an aldehyde under slightly acidic conditions where the pH is less than 7 and where the molar ratio of the primary amine from the amino compound to the tannin repeating unit is from about 1.5:1 to 3.0:1. The intermediate viscosity of the reaction mixture is monitored until the reaction mixture has an intermediate viscosity within the range of the system key intermediate viscosity range. This system key intermediate viscosity range is previously determined for each reactant system to be employed. It is a narrow intermediate viscosity range that is experimentally determined which permits the resulting product to have a long shelf life.
    Type: Grant
    Filed: January 24, 1984
    Date of Patent: December 10, 1985
    Assignee: Dearborn Chemical Company
    Inventors: Jane E. Quamme, Anne H. Kemp
  • Patent number: 4556493
    Abstract: The accumulation of scale in an aqueous system is inhibited by the addition of a composition comprising a copolymer of maleic acid or anhydride and and styrene sulfonic acid, an organic phosphonate such as aminotri(methylene phosphonic acid) or hydroxyethylidene diphosphonic acid, and an aminocarboxylate chelating compound such as nitrilotriacetic acid or ethylenediamine tetraacetic acid, or their water soluble salts.
    Type: Grant
    Filed: March 7, 1985
    Date of Patent: December 3, 1985
    Assignee: Dearborn Chemical Company
    Inventor: Dionisio G. Cuisia
  • Patent number: 4428866
    Abstract: A mixture of an alkyl amine, e.g., tri-n-propylamine and an SO.sub.3 -containing acid, preferably, sulfamic acid is injected into the flue gas stream of a coal-fired utility boiler to reduce the electrical resistivity of the fly-ash particles and to increase their mean particle size, thereby improving their recovery by electrostatic precipitation or by mechanical separation, with consequent reduction in stack emission.
    Type: Grant
    Filed: August 19, 1982
    Date of Patent: January 31, 1984
    Assignee: Dearborn Chemical Company
    Inventors: Richard L. Every, Franklin D. Lewandowski, Jerome F. Lech
  • Patent number: 4399098
    Abstract: A method for treating water to retard corrosion due to dissolved oxygen, especially boiler feed waters and boiler water condensates, is disclosed. Semicarbazide and its salts are highly effective oxygen scavengers for use in aqueous systems and thereby effect reduction of corrosion resulting from dissolved oxygen.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: August 16, 1983
    Assignee: Dearborn Chemical Company
    Inventor: Dionisio G. Cuisia
  • Patent number: 4375359
    Abstract: Fireside additive is introduced into oil-fired furnace as aqueous solution via oil-water homogenizer feeding to burner.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: March 1, 1983
    Assignee: Dearborn Chemical Company Limited
    Inventors: Stuart R. Chapman, F. Ross Pollard
  • Patent number: 4369719
    Abstract: Uncalcined vermiculite is injected into the coal fired furnace, at 3000.degree.-1200.degree. F., thereby facilitating removal of deposits that accumulate on line within the furnace.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: January 25, 1983
    Assignee: Dearborn Chemical Company
    Inventors: Gary G. Engstrom, Douglas I. Bain
  • Patent number: 4352747
    Abstract: A mixture of an alkyl amine, e.g., tri-n-propylamine and an SO.sub.3 -containing acid, preferably, sulfamic acid is injected into the flue gas stream of a coal-fired utility boiler to reduce the electrical resistivity of the fly-ash particles and to increase their mean particle size, thereby improving their recovery by electrostatic precipitation or by mechanical separation, with consequent reduction in stack emissions.
    Type: Grant
    Filed: March 30, 1979
    Date of Patent: October 5, 1982
    Assignee: Dearborn Chemical Company
    Inventors: Richard L. Every, Franklin D. Lewandowski, Jerome F. Lech
  • Patent number: 4350606
    Abstract: Corrosion in steam condensate lines is inhibited by maintaining a mix of a hydroxylamine compound and a neutralizing amine in the water.
    Type: Grant
    Filed: October 3, 1980
    Date of Patent: September 21, 1982
    Assignee: Dearborn Chemical Company
    Inventors: Dionisio G. Cuisia, Chih M. Hwa