Patents Assigned to Filtrona International Ltd.
  • Patent number: 6718989
    Abstract: A filter for a cigarette and a filter-tipped cigarette having a high degree of freedom in control of filtering-efficiency of smoke are provided. The filter has a core 10 and a sheath 12 made preferably of tow of cellulose acetate fibers. A plurality of axial passages 16 is formed between the core and the sheath and extend continuously between both end faces of the filter.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: April 13, 2004
    Assignees: Japan Tobacco Inc., Filtrona International Ltd.
    Inventors: Paul Clarke, John Charlton, Ichiro Atobe, Atsushi Tokida
  • Patent number: 6422244
    Abstract: A filter for a cigarette and a filter cigarette which make a smoking feeling much milder without the original cigarette taste and aroma being spoiled are provided. The cigarette filter has a filter rod 8 having an air permeable peripheral surface, and 3 to 12 axial passages 12 in the rod 8. These passages 12 are distributed on a ring having a diameter of 50 to 70% of that of the rod and have a diameter of 0.1 to 0.7 mm. The wall of the axial passages 12 have air permeability. In smoking, ventilation air introduced into the passages 12 dilutes the smoke stream from the cigarette.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: July 23, 2002
    Assignees: Japan Tobacco, Inc., Filtrona International Ltd.
    Inventors: Paul Clarke, John Charlton, Ichiro Atobe, Masanori Koborinai