Patents by Inventor Joseph Siebel

Joseph Siebel 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).

  • 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