Patents by Inventor Therese E. Niemi

Therese E. Niemi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Visible chromium- and phosphorus-free conversion coating for aluminum and its alloys
    Patent number: 6464800
    Abstract: A visible colored chromium- and phosphorus-free conversion coating can be formed on a metal surface by contacting it with an aqueous liquid composition that comprises an alizarine dye and a product of chemical interaction between a first initial reagent component selected from the group consisting of fluoroacids of the elements titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin; and a second initial reagent component selected from the group consisting of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin and all of oxides, hydroxides, and carbonates of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: October 15, 2002
    Assignee: Henkel Corporation
    Inventors: Lawrence R. Carlson, Patrick A. Scalera, Therese E. Niemi, Shawn E. Dolan