Patents Assigned to Dearborn Chemical Company Limited
  • Pitch control
    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
  • Rust removal and composition thereof
    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
  • Method for flocculating and removing solids suspended in water
    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
  • Composition and method for flocculating and removing solids suspended in water
    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
  • Composition and method for deoxygenation
    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
  • Water based fireside additive
    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