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US09138016B2 Smoking articles with significantly reduced gas vapor phase smoking constituents 有权
吸烟制品具有显着降低的气相吸烟成分

Smoking articles with significantly reduced gas vapor phase smoking constituents
Abstract:
A smoking article having a tobacco rod, which is adapted to produce mainstream smoke, and a filter attached to said tobacco rod. A permeable wrapping paper circumscribes the tobacco rod and the filter. The filter has an upstream end portion and a downstream end portion, and includes a flow restricting segment of smoke impermeable material, which includes at least one open flow passage therethrough to deliver mainstream smoke, and a cavity downstream of the flow restricting segment. The smoking article also includes at least one ventilation zone upstream of the flow restricting segment.
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