High efficiency cigarette filters having shaped micro cavity fibers impregnated with adsorbent or absorbent materials
US6907885B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2003 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | Feb 11, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D39/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.