Patents Assigned to Circle-Prosco, Inc.
  • Hydrophilic coatings for aluminum
    Patent number: 5441580
    Abstract: A chromium-free conversion coating for aluminum finstock includes zirconium, fluoride and potassium ions. The coating is preferably at a pH below about 2.0, and may optionally include polyphosphates, tannin, boron and zinc. A sequestering agent to complex dissolved iron, and a crystal deformation agent such as ATMP are also preferably included.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: August 15, 1995
    Assignee: Circle-Prosco, Inc.
    Inventor: Charles E. Tomlinson
  • Conversion coatings for metal surfaces
    Patent number: 5380374
    Abstract: A conversion coating for aluminum, ferrous and magnesium alloyed materials includes zirconium, fluoride and calcium ions. The coating is preferably at a pH of between about 2.6 and about 3.1, and may optionally include phosphates, polyphosphates, tannin, boron, zinc and aluminum. A sequestering agent to complex dissolved iron, and a crystal deformation agent such as ATMP are also preferably included.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: January 10, 1995
    Assignee: Circle-Prosco, Inc.
    Inventor: Charles E. Tomlinson