Tobacco smoke filter and method and apparatus for making same
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United States of America Patent
Stats
-
Jan 20, 1987
Grant Date -
N/A
app pub date -
May 7, 1981
filing date -
May 7, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved tobacco smoke filter is characterized by longitudinally continuous grooves running from end-to-end in the peripheral surface of a smoke-impervious filter plug wrap. Smoke-impervious tipping surrounds the plug wrap to seal the grooves except for small ventilation holes in the tipping which permit communication between the grooves and the ambient air. In a preferred embodiment, the grooves are restricted toward the mouth end of the filter and the degree of restriction determines the direction of air and smoke flow in the grooves. The grooves are each preferably formed as two longitudinal sections of different cross-section. Apparatus and method for manufacturing the filter are disclosed.
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Family
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