Method of preparing tobacco smoke filter
US3966912A · kind A · utility
4Cited by
9References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 1, 1975 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Aug 1, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/0212
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A tobacco smoke filter element for use in cigarettes, cigarette holders, cigar holders or pipes is formed from a bonded non-woven fabric composed wholly or partly of wool fibers. It is preferred that the content of wool fibers shall be as high as is economically feasible. It is preferred that in the case of a filter for a cigarette the filter is made by converting a web of bonded non-woven fabric to a filter rod of substantially circular cross-section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.