Tobacco – Smoke separator or treater – Interior surface causes particular flow characteristic
Reexamination Certificate
2011-01-25
2011-01-25
Lopez, Carlos (Department: 1747)
Tobacco
Smoke separator or treater
Interior surface causes particular flow characteristic
C131S361000
Reexamination Certificate
active
07874296
ABSTRACT:
Cigarette gas filter is used to filter the gaseous components of main stream smoke. This causes reduction of the delivery of the gaseous constituents of main stream smoke (MSS). The gas filter consists of a narrow annular gap, where the outer side is circumvented by a high permeability wrapper paper. As the cigarette smoke is passed through this annulus gap, the fraction of gases present in the smoke is reduced by diffusion mechanism and due to inflow of air into the annulus by convection mechanism. Since the diffusion coefficient of aerosol particles are several orders of magnitude smaller than the gas molecules, the aerosol particles are kept mainly intact while passing through the annulus. Therefore this filter is applied for reducing the gas/tar ratio. This filter can also be used to filter the gases of non-cigarette smokes.
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