Patents Assigned to Ekoperl GmbH
  • Process for dust reduction treatment of expanded perlite
    Patent number: 4148941
    Abstract: The dust fraction of expanded perlite is bonded to the larger sized grains by spraying finely atomized paraffin at a temperature of less than 130.degree. C. upon the perlite which has been cooled to a temperature of less than 130.degree. C. In a second embodiment of the invention, the perlite is treated with a water repellent process prior to the paraffin treatment.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: April 10, 1979
    Assignee: Ekoperl GmbH
    Inventors: Hans Pape, Joseph Siebel