Cigarette with automatic ventilation valve
US4615344A · kind A · utility
2Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1984 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | Feb 14, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/041
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A cigarette is provided with an automatic valve responsive to the moisture content of the smoke for controlling induction of air into the smoke thereby compensating for the increase of nicotine concentration as the cigarette smokes down. The valve utilizes a bilamellar strip having sides of different hydrophilic character and distorting as a result of elongation of the more hydrophilic side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.