Patents by Inventor Daniel Preuss

Daniel Preuss 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).

  • Method and apparatus for the clean replacement of contaminated HEPA filters
    Patent number: 6364923
    Abstract: A method and apparatus are provided for the replacement of contaminated HEPA filters without contamination of the surrounding environment. A filter housing is generally cylindrical and defines a filter receiving cavity. The filter housing having a filter receiving end and a filter removing end. An active HEPA filter is received within the filter housing cavity and is located near the filter removing end. A backup HEPA filter is received within the filter housing cavity and is located near the filter receiving end. A change-out bag is received within the filter housing cavity and is located adjacent to the filter removing end. The filter housing includes a gas flow path through the active HEPA filter without passing through the backup HEPA filter. For the replacement of contaminated HEPA filter, end covers are removed from the filter receiving end and the filter removing end of the filter housing and the change-out bag is opened.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: April 2, 2002
    Assignee: The University of Chicago
    Inventors: Stanley G. Wiedmeyer, Arthur A. Frigo, Daniel Preuss, Edward F. Bielick, Richard F. Malecha