High efficiency cigarette filters having shaped micro cavity...

Details High efficiency cigarette filters having shaped micro cavity... High efficiency cigarette filters having shaped micro cavity...

2005-06-21

2005-06-21

Walls, Dionne A. (Department: 1731)

Tobacco

Tobacco users' appliance

Device used for smoking

C131S342000, C131S331000, C131S200000, C131S201000

Reexamination Certificate

active

06907885

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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