Patents Assigned to The United States of American as represented by the Administrator of Environmental Protection Agency
  • Virtual impactor for removing particles from an airstream and method for using same
    Patent number: 5425802
    Abstract: A virtual impactor that can remove essentially all of the particles from an airstream is disclosed. Also disclosed are a method of separating particles from the airstream using this virtual impactor, a method of concentrating the particulate matter in an airstream, and the concentrated airstream.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: June 20, 1995
    Assignees: The United States of American as represented by the Administrator of Environmental Protection Agency, President and Fellows of Harvard
    Inventors: Robert M. Burton, Petros Koutrakis, Costas Sioutas
  • Vacuum extractor incorporating a condenser column
    Patent number: 5411707
    Abstract: Methods and apparatus for vacuum distillation of samples suspected of containing pollutants are disclosed. The vacuum distillation apparatus contains a condenser for separating water and/or another common interfering contaminant. The distilled pollutants are assayed using a gas chromatograph/mass spectrometer.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: May 2, 1995
    Assignee: The United States of American as represented by the Administrator of the Environmental Protection Agency
    Inventor: Michael H. Hiatt