Cigarette filter
US4343319A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1980 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Nov 28, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/043
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A filter for a cigarette includes a porous filter rod with at least one opening in each end thereof with at least one longitudinal groove embedded into the outer periphery of the rod intermediate the openings and in flow communication therewith. The filter rod is wrapped with non-porous plug wrap and overlaid with porous tipping material with the flow-through groove being between the plug wrap and the tipping material so that a portion of the smoke coming from a tobacco column mixes with ventilating air in the groove and the remaining portion of the tobacco smoke passes through the filter, with little or no contact with ventilating air until it reaches the smoker's mouth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.