Title:
CIGARETTE FILTER
Document Type and Number:
Japanese Patent JPS5394098
Kind Code:
A
Abstract:
A tobacco-smoke filter comprises a plug of filter material of which a transverse cross section is impervious to the passage of smoke except for a minor proportion of the area of that cross section which forms a smoke-accelerating orifice, the plug being enclosed by an envelope permitting ingress of air into a region of the plug downstream of the orifice. The cross section may be impervious because of the presence of a barrier diaphragm of impervious material. Thus an annular groove may be provided in the plug at the cross section and may be filled with, or have its walls coated with, an impervious material. Alternatively the cross section may be impervious by reason of the closure of interstices in the filter material by the local application of heat thereto.
Inventors:
HENRII JIYOOJI HAASUUERU
JIYON DABUIDO GURIIN
JIYON ANSONII RUUKU
SUTANREI MAIBEN KIYANDORITSUSH
JIYON DABUIDO GURIIN
JIYON ANSONII RUUKU
SUTANREI MAIBEN KIYANDORITSUSH
Application Number:
JP12048177A
Publication Date:
August 17, 1978
Filing Date:
October 06, 1977
Export Citation:
Assignee:
BRITISH AMERICAN TOBACCO CO
International Classes:
A24D3/04; (IPC1-7): A24D1/06
Domestic Patent References:
| JP40004315A | ||||
| JPS4712300U | 1972-10-13 | |||
| JPS5238099A | 1977-03-24 | |||
| JPS5212998A | 1977-01-31 |