Patents by Inventor Paul E.L. Hansen

Paul E.L. Hansen 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 culturing with microbiological dry culture medium
    Patent number: 5089413
    Abstract: A device useful for growing aerobic microorganisms, particularly molds. The device employs a relatively small amount of water-reconstitutable medium that can be sealed in order to prevent desiccation and contamination of the medium yet still provide an adequate supply of air to the medium, by the use of a membrane underlying the medium, to support the growth of aerobic microorganisms.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: February 18, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert L. Nelson, Paul E.L. Hansen