Nonwoven fibrous web for tobacco filter
US5022964A · kind A · utility
44Cited by
11References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 6, 1989 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Jun 6, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/10
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A nonwoven fibrous web material that contains cellulose ester fibers, cellulose ester fibrets and a minor amount of activated fusible fibers uniformly dispersed throughout is particularly well suited as a filter media. The activated fusible fibers are effective for retaining within the filter web any particulate material resulting from corrugation without adversely affecting the filtration efficiency of the cellulose ester fibers and fibrets. Alternatively, the fibrous web material may include an effective amount of natural cellulosic fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.