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| US4564030 | 16 Jul 1982 | 14 Jan 1986 | Loew's Theatres, Inc. | Cigarette filter assembly |
| US4942887 | 9 Jun 1988 | 24 Jul 1990 | Fabriques de Tabac Reunies, S.A. | Filter mouthpiece for a smoking article |
| US6860273 | 25 Oct 2002 | 1 Mar 2005 | Philip Morris Incorporated | Cigarette with adsorbent at tip end thereof |
| USRE32221 | 2 Oct 1984 | 12 Aug 1986 | | Variable dilution filter |
