Patents by Inventor Per Perman

Per Perman 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).

  • Chip-washing arrangement
    Patent number: 5882509
    Abstract: Apparatus for treating wash water is disclosed. The apparatus includes a settling tank in which sludge is separated from the wash water, a circulation tank for temporary storage of the clean wash water from the settling tank, and from which the clean wash water can be recycled for washing further chips, and a hydrocyclone for separating water from the sludge for recycle to the settling tank. Methods for treating wash water utilizing such apparatus are also disclosed.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: March 16, 1999
    Assignee: Sunds Defibrator Industries AB
    Inventor: Per Perman