The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 1981
Filed:
Jul. 31, 1978
Shigeo Sato, Hitachishi, Ibarakiken, JP;
Other;
Abstract
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.