Pocket-type charcoal filter and cigarette made therewith
US4184412A · kind A · utility
23Cited by
4References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1978 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Mar 20, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/0225
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The apparatus for making the filter forms a stream of tow into a U-shaped trough so that charges of charcoal can be injected into the trough by a charcoal wheel. The shape of the tow is ensured by feeding the tow into a funnel-shaped passageway from below the level of the passageway, the tow remains U-shaped without the need of any other means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.