|
| US4291711 | 27 Mar 1979 | 29 Sep 1981 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
| US4355995 | 3 Apr 1981 | 26 Oct 1982 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
| US4433696 | 2 Oct 1981 | 28 Feb 1984 | Philip Morris Incorporated | Variable dilution filter |
| US4687008 | 17 Apr 1986 | 18 Aug 1987 | Philip Morris Incorporated | Filter cigarette |
| US4696314 | 17 Apr 1986 | 29 Sep 1987 | Philip Morris Incorporated | Filter cigarette |
| US4726385 | 9 May 1986 | 23 Feb 1988 | The American Tobacco Company | Method of fabricating an all-tobacco cigarette controlling tar delivery and an all-tobacco cigarette |
| US4889143 | 14 May 1986 | 26 Dec 1989 | R. J. Reynolds Tobacco Company | Cigarette rods and filters containing strands provided from sheet-like materials |
| US4924883 | 6 Mar 1987 | 15 May 1990 | R. J. Reynolds Tobacco Company | Smoking article |
| US4966171 | 27 Jan 1989 | 30 Oct 1990 | Philip Morris Incorporated | Smoking article |
| US4981522 | 22 Jul 1988 | 1 Jan 1991 | Philip Morris Incorporated | Thermally releasable flavor source for smoking articles |
| US4991606 | 22 Jul 1988 | 12 Feb 1991 | Philip Morris Incorporated | Smoking article |
| US5025814 | 12 May 1987 | 25 Jun 1991 | R. J. Reynolds Tobacco Company | Cigarette filters containing strands of tobacco-containing materials |
| US5115823 | 20 Dec 1990 | 26 May 1992 | Philip Morris Incorporated | Flavor-enhancing smoking filter |
| US5345951 | 12 Aug 1992 | 13 Sep 1994 | Philip Morris Incorporated | Smoking article |
| US5443560 | 14 Dec 1992 | 22 Aug 1995 | Philip Morris Incorporated | Chemical heat source comprising metal nitride, metal oxide and carbon |
| US7237558 | 30 Sep 2003 | 3 Jul 2007 | R. J. Reynolds Tobacco Company | Filtered cigarette incorporating an adsorbent material |
| US7240678 | 30 Sep 2003 | 10 Jul 2007 | R. J. Reynolds Tobacco Company | Filtered cigarette incorporating an adsorbent material |
| US7669604 | 30 Sep 2003 | 2 Mar 2010 | R.J. Reynolds Tobacco Company | Filtered cigarette incorporating an adsorbent material |
| US7699061 | 30 Jul 2007 | 20 Apr 2010 | Philip Morris USA Inc. | Multi-component filter providing multiple flavour enhancement |
| US7827997 | 5 Jun 2007 | 9 Nov 2010 | R. J. Reynolds Tobacco Company | Filtered cigarette incorporating an adsorbent material |
| US7856990 | 30 Sep 2003 | 28 Dec 2010 | R. J. Reynolds Tobacco Company | Filtered cigarette incorporating an adsorbent material |
| US7987857 | 3 Mar 2010 | 2 Aug 2011 | Philip Morris USA Inc. | Multi-component filter providing multiple flavour enhancement |
| US8066011 | 30 Sep 2003 | 29 Nov 2011 | R. J. Reynolds Tobacco Company | Filtered cigarette incorporating an adsorbent material |
| USRE32221 | 2 Oct 1984 | 12 Aug 1986 | | Variable dilution filter |
