Patents Assigned to Process Development Corporation
  • Patent number: 4391411
    Abstract: A method and apparatus for comminuting minerals and similar materials by vacuum comminution includes an arrangement for introducing the material to the low pressure chamber at a high velocity whereby the rate of change of pressure on the particles of material is greatly increased. The degree of comminution is thereby increased and the effectiveness of the system greatly enhanced.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: July 5, 1983
    Assignee: Process Development Corporation
    Inventor: William A. Colburn