Tobacco smoke filter material and process for production thereof
US5150721A · kind A · utility
7Cited by
0References
7Claims
0Family size
Inventors
Key dates
| Filing date | Oct 10, 1990 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Oct 10, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/14
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Disclosed is a novel process of preparing tobacco smoke filter material, wherein an acidic compound such as citric acid is dissolved in a cellulose acetate spinning solution prior to spinning the filaments of the filter material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.