Filter element comprising smoke-altering material
US8997755B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 2009 |
| Grant date | Apr 7, 2015 |
| Priority date | — |
| Expiry date | Dec 3, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/048
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention provides a filter element of a smoking article having a longitudinal axis and adapted for filtration of mainstream smoke generated by the smoking article, the filter element including a first region extending along the longitudinal axis of the filter element and exhibiting a first pressure drop and a second region extending along the longitudinal axis of the filter element and exhibiting a second pressure drop lower than said first pressure drop, wherein the first and second regions are arranged in a side-by-side configuration such that both regions are visible in a cross-section of the filter element perpendicular to the longitudinal axis, and wherein mainstream smoke can move from the second region into the first region, and further comprising a smoke-altering material, such as an oxidation catalyst, positioned in the first region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.