| CA2462513: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 04/05/2004 |
| DE1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| ES1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| FR1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| GB1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| GR1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| IT1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| PT1434503: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 09/29/2004 |
| JP3966856: Activated charcoal filter for effectively reducing parabenzosemiquinone from the main stream cigaratte smoke | November 29, 2022 | 01/31/2002 |
| US7025067: Activated charcoal filter for effectively reducing p-benzosemiquinone from the mainstream cigarette smoke | November 29, 2022 | 02/13/2002 |