Aeration groove filter
US4219030A · kind A · utility
9Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1978 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Oct 26, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/0258
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The filter plug of the cigarette is provided with an annular peripheral groove to enable air to pass directly into the fibrous body of the filter material after passing through apertures in the tipping paper. Use is made of ordinary plug wrap paper instead of a high porosity tea bag paper to wrap the fibrous filter material. The groove extends through the layer of plug wrap paper and thus communicates directly with the filter material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.