Defensive publication

Abstract

Abstract TOBACCO SMOKE FILTER CONTAINING AN ADDITIVE OR MIXED METAL OXIDES SUCH AS HOPCALITE FOR THE SELECTIVE REMOVAL OF OXIDES OF NITROGEN (NO AND NO2) FROM TOBACCO SMOKE. THE METAL OXIDES MAY BE PRIMARILY THE OXIDES OF MANGANESE AND COPPER, WITH SMALL AMOUNTS OF THE OXIDES OF CHROMIUM, IRON, SILVER, COBALT, ZINC, PALLADIUM AND CADMIUM. THE FILTER ADDITIVES MAY BE EMPLOYED AS GRANULES OF THE METAL OXIDE MIXTURE, OR AS POWDERS AND THEY MAY BE IMPREGNATED ON A SOLID SUPPORT SUCH AS ALUMINA. THE GRANULES SHOULD HAVE A SURFACE AREA OF 25 TO 500 M2/G. AND PORES WITH DIAMETERS RANGING FROM 5 A TO 100 A. THE ADDITIVE MAY BE APPLIED TO FILTERING MATERIAL SUCH AS CELLULOSE ACETATE TOW OR AS ONE COMPONENT OF A MULTICOMPONTENT FILTER. FURTHER, THE FILTER MAY BE VENTED TO ALLOW FROM 10 TO 40% DILUTION OF THE SMOKE AND SHOULD BE DESIGNED SO THAT AIR ENTERING THE FILTER THROUGH THE VENTS DOES NOT ENTER THE SMOKE STREAM IN FRONT OF THE CHAMBER CONTAINING THE FILTER ADDITIVE. THE VENTING IS CONVENIENTLY ACHIEVED WITH AN INNER CHAMBER WHICH CHANNELS FRESH AIR AROUND THE PERIPHERY OF THE FILTER AND INTO THE SMOKER''S MOUTH.

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