Patents Assigned to WIBAU (WesDeutsche Industrie- und Strassenbaumaschinen-Gesellschaft m.b.H.)
  • Method of producing a mixture of bitumen and subdivided solid mineral matter
    Patent number: 3986889
    Abstract: Method of producing a mixture of bitumen and subdivided solid mineral matter, comprising mixing pure bitumen with subdivided solid mineral matter containing moisture in at least such proportion as is picked up by the mineral matter from the atmosphere and heating the mixture to a temperature of about 120.degree. to about 250.degree. C.
    Type: Grant
    Filed: May 15, 1975
    Date of Patent: October 19, 1976
    Assignee: WIBAU (WesDeutsche Industrie- und Strassenbaumaschinen-Gesellschaft m.b.H.)
    Inventors: Emile Muntzer, Paul E. Muntzer