Patents by Inventor Visa Vehmanen

Visa Vehmanen 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).

  • Method of preparing a well-dispersable microcrystalline titanium dioxide product, the product, and the use thereof
    Patent number: 8182602
    Abstract: The invention relates to a method of preparing a well-dispersable, rutile-structured, microcrystalline titanium dioxide product, a product prepared by the method, and an effect paint and a lacquer provided by means of the product. In the method, the titanium dioxide starting material is first treated with a base to have an alkaline pH value, after which it is treated with an acid to have a hydrochloric acid content of 8 to 30 g/l, neutralized, processed, and calcinated. In particular, the preparation method is characterized by the use of a pretreatment chemical before the calcination stage to improve the dispersability.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: May 22, 2012
    Assignee: Sachtleben Pigments Oy
    Inventors: Ralf-Johan Lamminmäki, Esa Latva-Nirva, Riitta Linho, Johanna Niinimäki, Visa Vehmanen
  • METHOD OF PREPARING A WELL-DISPERSABLE MICROCRYSTALLINE TITANIUM DIOXIDE PRODUCT, THE PRODUCT, AND THE USE THEREOF
    Publication number: 20110192322
    Abstract: The invention relates to a method of preparing a well-dispersable, rutile-structured, microcrystalline titanium dioxide product, a product prepared by the method, and an effect paint and a lacquer provided by means of the product. In the method, the titanium dioxide starting material is first treated with a base to have an alkaline pH value, after which it is treated with an acid to have a hydrochloric acid content of 8 to 30 g/l, neutralized, processed, and calcinated. In particular, the preparation method is characterized by the use of a pretreatment chemical before the calcination stage to improve the dispersability.
    Type: Application
    Filed: August 15, 2008
    Publication date: August 11, 2011
    Inventors: Ralf-Johan Lamminmäki, Esa Latva-Nirva, Riitta Linho, Johanna Niinimäki, Visa Vehmanen