Patents by Inventor Esa Pirttinen

Esa Pirttinen 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 separating colouring agents, particularly printing ink, from recycled fibre material
    Publication number: 20040188480
    Abstract: A method of separating colouring agents, particularly printing ink, from recycled fibre material, in which method the recycled fibre material is defibered using a liquid, so that colouring agent is separated from the recycled fibre during the defibration. In the method, the pre-kneaded recycled fibre is applied to a double-action impact mill, where it is subjected to successive impacts, so that the treatment time is at most some seconds.
    Type: Application
    Filed: April 9, 2004
    Publication date: September 30, 2004
    Inventors: Carl-Olof Palm, Hannu Virtanen, Esa Pirttinen