Patents by Inventor Robert Puhala

Robert Puhala 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).

  • Gas mask filter canister
    Publication number: 20050160911
    Abstract: A filter for a gas mask has an elliptical or circular, convex shape to conform to the curvature of the wearer's face, or a planar shape. The filter comprises a double particulate filter element and a double adsorption filter element configured for axial airflow therethrough with a bifurcated flow pattern. The adsorption filter element comprises a granulated charcoal, a composite material having carbon particles combined with binder particles, or an immobilized bed of charcoal granules and EVA-coated fibers.
    Type: Application
    Filed: April 25, 2003
    Publication date: July 28, 2005
    Inventors: David Friday, John Schlaechter, Wayne Ballantyne, John Mable, Robert Puhala, David Pike