Production of cigarette filter units
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 29, 1980
Issued Date -
N/A
app pub date -
Jul 21, 1978
filing date -
Dec 8, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Cigarette filter units are made in a long strip with alternate portions of fibrous and pourable filter material. The fibrous portions are first attached at spaced intervals to a sheathing strip which is wrapped practically right around them to form a cylinder with regular empty spaces between the fibrous portions and openings into the spaces. In a special unit, air is extracted from these spaces so that when the spaces enter a chamber containing pourable filter material, they suck the material in to fully fill the spaces. Excess filter material is brushed off the filter unit, and a sealing strip is stuck over the openings.
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Family
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Cited Art Landscape
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