The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2007
Filed:
Apr. 29, 2005
Marino Dimarzo, Bethesda, MD (US);
John Gunderson, Mesa, AZ (US);
Marino Dimarzo, Bethesda, MD (US);
John Gunderson, Mesa, AZ (US);
University of Maryland, College Park, MD (US);
Abstract
A foam-generating assembly for use in generating a nitrogen-containing foam useful in preventing or extinguishing fires includes a foam generator, a first tank containing a foamable aqueous liquid and a second tank containing nitrogen gas, the foam generator including a header which is hollowed out to provide a swirl chamber defined by an outer cylindrical wall, an inner cylindrical wall and a floor, a spray nozzle in the center of the floor for spraying foamable aqueous liquid supplied from the first tank, and an orifice in the inner cylindrical wall to supply a tangential flow of nitrogen gas from the second tank into the swirl chamber and around the spray nozzle and the liquid spray emitted therefrom and provide a vortex flow of a mixture of foamable aqueous liquid and nitrogen gas. First and second foaming screens are provided through which the vortex flow passes to provide first a coarse nitrogen-containing foam and then a fine nitrogen-containing foam. The first foaming screen can be a inverted frustoconical element formed of three layers of metal mesh. The second foaming screen can be formed of two layers of metal mesh placed over a discharge outlet of the swirl chamber.