Tobacco – Tobacco users' appliance – Supports
Patent
1975-06-19
1977-12-13
Michell, Robert W.
Tobacco
Tobacco users' appliance
Supports
131 107, 131207, 131266, 131267, 131269, 55387, 260 4214, 260 4244, 260 4253, A24B 15027
Patent
active
040623688
ABSTRACT:
According to the invention, a material for the filtration of tobacco smoke by reduction of vapor-phase constituents without adverse effect on the taste of the smoke comprises carbon particles of a size substantially within the range of 300 to 1700 micron, coated over their surfaces, individually and without being bonded together, with a barrier layer which has a thickness within the range of 5 .times. 10.sup.-4 to 0.5 micron and which is discontinuous in that it has a porosity within the range of 7,000 to 200,000 cm.sup.3 /min/10 cm.sup.2 per 10 cm water gauge and a permeability for organic vapors contained in tobacco smoke such that it permits the passage of molecules within the size range 5 .times. 10.sup.-4 to 2 micron, the said layer being composed substantially of an organic non-nitrogen-containing polymeric material which is non-volatile, substantially non-water-soluble and non-toxic. The invention is further concerned with tobacco smoke filters comprising such coated carbon particles.
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Crellin Robin Arthur
Jenkins Christopher Robert
Phelpstead James William Percy
Brown & Williamson Tobacco Corporation
Gron T. S.
Mason William J.
Michell Robert W.
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