Patents by Inventor Herbert A. Malmstrom

Herbert A. Malmstrom 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).

  • Protective shelter flow control apparatus
    Patent number: 4558636
    Abstract: A flow control apparatus for a protective shelter including valve means to allow preselected maximum and minimum amounts of air flow into the shelter depending upon ambient contaminant concentrations.
    Type: Grant
    Filed: April 30, 1984
    Date of Patent: December 17, 1985
    Assignee: Engineered Air Systems, Inc.
    Inventors: Herbert A. Malmstrom, Henry A. Roddiger