Cigarette filter
US7228861B2 · kind B2 · utility
0Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2004 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | May 4, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/163
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A cigarette filter has filter sections including filter materials individually wrapped with plug wrap paper, forming paper for wrapping the filter sections integrally, and tipping paper covering the forming paper so as to connect the filter sections to a cigarette section to form a cigarette, wherein activated charcoal and an inorganic mineral-based porous material carrying ferrous sulfate/L-ascorbic acid are contained as adsorbents in at least one of the filter materials and a space between the filter materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.