Patents Assigned to Dearborn Chemicals Limited
  • Method of inhibiting corrosion in aqueous systems
    Patent number: 4692316
    Abstract: A method for inhibiting corrosion in an aqueous system which comprises adding to the system a corrosion inhibiting salt capable of forming a passivating film at the anode, and a substantially linear cationic polymer, is especially useful in cooling water systems and their associated equipment.
    Type: Grant
    Filed: March 20, 1985
    Date of Patent: September 8, 1987
    Assignee: Dearborn Chemicals Limited
    Inventors: Brian Greaves, Stuart J. Grenside
  • Method of inhibiting corrosion in aqueous systems
    Patent number: 4692315
    Abstract: A method for inhibiting corrosion in an aqueous system is described which comprises adding to the system a corrosion inhibiting metal salt capable of forming a passivating film of a water insoluble salt of said metal at the cathode, and a substantially linear cationic polymer.
    Type: Grant
    Filed: April 17, 1985
    Date of Patent: September 8, 1987
    Assignee: Dearborn Chemicals Limited
    Inventors: Brian Greaves, Paul Ingham
  • Prevention of corrosion
    Patent number: 4689201
    Abstract: Corrosion in liquid, especially aqueous systems such as cooling systems, is controlled by the addition of a vegetable tannin or a derivative thereof, a triazole, a hydroxylamine, a neutralizing amine, and a water soluble salt of a Group II metal, in particular zinc, magnesium or calcium.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: August 25, 1987
    Assignee: Dearborn Chemicals Limited
    Inventors: Stuart W. Longworth, John G. Baker
  • Treatment of aqueous systems
    Patent number: 4557896
    Abstract: Composition and method for inhibiting corrosion in aqueous systems using synergistic combination of an inorganic nitrite and a phosphonate, e.g., 10-20 ppm sodium nitrite plus 0.5-5 ppm hydroxyethylidene diphosphonic acid.
    Type: Grant
    Filed: June 9, 1981
    Date of Patent: December 10, 1985
    Assignee: Dearborn Chemicals Limited
    Inventors: Philip Brocklebank, John J. Bennison
  • Biocide
    Patent number: 4539071
    Abstract: This invention relates to the elimination of bacterial deposits in cooling water systems and in water systems used in paper making. This is achieved by using a combination of glutaraldehyde and isothiazolone.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: September 3, 1985
    Assignee: Dearborn Chemicals Limited
    Inventors: Richard P. Clifford, Gerrard A. Birchall