Tobacco filter and method of removing impurities from tobacco smoke

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4253476
SERIAL NO

05929233

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A tobacco filter having a hollow cylindrical body which is preferably transparent, is provided with a plurality of small holes in its outer wall, and with a solid impermeable hit-stick coaxially positioned within the hollow body. A porous annular-shaped filter element surrounds the axial mid-part of the hit-stick. Impurities in tobacco smoke are removed by a process of hit-sticking extraction in the form of numerous black dots on the surface of the hit-stick as well as the result of automatic, rapid self-liquefication of the filter element. At one end of the hollow cylindrical body a filter tip is positioned to be held in the mouth of the smoker, and at the other end is a cigarette holding part for receiving and holding a conventional cigarette. The hit-sticking extraction results from air jets being drawn into an annularly shaped passageway located between the outer surface of the hit-stick and the inside surface of the hollow cylindrical body and through which smoke flows axially as the smoker draws on the filter.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Sato, Shigeo Hitachishi, Ibarakiken, JP 27 334

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