Smoking article filter with annular restrictor and downstream ventilation
US8109277B2 · kind B2 · utility
5Cited by
146References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2008 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Dec 8, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/045
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A smoking article includes a tobacco rod adapted to produce mainstream smoke, and a filter having an upstream end portion and a downstream end portion. The filter includes a ventilated cavity and a flow restrictor segment having an impermeable insert at least partially surrounded by a tubular segment of an air transmissive material upstream of the cavity. In an embodiment, the tubular segment at least partially defines the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.