High efficiency cigarette filters having shaped microcavity fibers impregnated with adsorbent or absorbent materials
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United States of America Patent
Stats
-
Jul 1, 2003
Grant Date -
Feb 21, 2002
app pub date -
Apr 20, 2001
filing date -
Apr 20, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
This invention is a highly efficient filter containing fibers that contain small particle size adsorbents/absorbents such as carbon and/or silica to selectively reduce targeted components in mainstream cigarette smoke. The invention relates to a novel class of highly efficient cigarette smoke filters made from much smaller solid fine particles (preferably 1-50 micrometers in diameter) impregnated in shaped fibers that possess open or semi-opened micro-cavity. The invention further relates to a cigarette having a plug/space/plug or plug/space configuration and having the impregnated filters resided in the space in bonded non-woven or freely unbounded manner to allow controlled TPM delivery.
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