Aeration groove filter
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United States of America Patent
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-
Aug 26, 1980
Issued Date -
N/A
app pub date -
Oct 26, 1978
filing date -
Aug 19, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The filter plug of the cigarette is provided with an annular peripheral groove to enable air to pass directly into the fibrous body of the filter material after passing through apertures in the tipping paper. Use is made of ordinary plug wrap paper instead of a high porosity tea bag paper to wrap the fibrous filter material. The groove extends through the layer of plug wrap paper and thus communicates directly with the filter material.
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