Patents Assigned to Pyrene Chemical Services Limited
  • Process and composition for conversion coating metal surfaces
    Patent number: 4801337
    Abstract: An improved composition and process for forming a corrosion-resistant complex oxide coating on a zinc or zinc alloy surface incorporates in an aqueous alkaline composition of pH value greater than 11 at least three complexed polyvalent metals, one of which is trivalent chromium.
    Type: Grant
    Filed: April 2, 1987
    Date of Patent: January 31, 1989
    Assignee: Pyrene Chemical Services Limited
    Inventor: George Higgins
  • Solution and process for coating metals
    Patent number: 4747885
    Abstract: A composition and process are useful for providing a corrosion resistant and lacquer receptive coating on the surface of drawn and ironed tin coated cans. The surface is contacted with an aqueous solution of tin containing ions, phosphate and an aromatic nitro compound at pH 1.5 to 3.5 preferably by spray application.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: May 31, 1988
    Assignee: Pyrene Chemical Services Limited
    Inventor: Zigmund Zoltowski
  • Processes and compositions for abrasive blast cleaning
    Patent number: 4729770
    Abstract: An aqueous wet blasting composition and process for cleaning a ferrous surface which reduces the rusting of the surface due to aqueous contact by incorporating phosphate ions and an imine compound in the composition.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: March 8, 1988
    Assignee: Pyrene Chemical Services Limited
    Inventor: George L. Higgins
  • Chromate coatings for metals
    Patent number: 4644029
    Abstract: A composition and method are particularly suitable for applying a corrosion preventive and paint receptive coating to metal surfaces where immersing treatment is impossible or impractical. A brush-on aqueous composition free of reducing agent containing hexavalent and trivalent chromium and at least 5 g/l of silica or silicate together with an organic solvent and thickening agent is applied to the metal surface and dried.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: February 17, 1987
    Assignee: Pyrene Chemical Services Limited
    Inventors: Jane Cable, George Higgins