Filter material for reducing harmful substances in tobacco smoke
Patent 6591839 Issued on July 15, 2003. Estimated Expiration Date: 
March 28, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 28, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsApplicationNo. 820233 filed on 03/28/2001US Classes:131/202, Filter and/or absorber131/201, Material separator and trap131/331, SMOKE SEPARATOR OR TREATER131/332, Having a polymer131/334, By chemical reaction, e.g., ion-exchange, chelating, catalytic, etc.131/341, Plural diverse elements131/342, Including particulate material131/346With indicator or inspection meansExaminersPrimary: Colaianni, Michael P.Attorney, Agent or FirmForeign Patent References
International ClassesA24D 001/04A24F 001/20 A24F 007/04 A24F 013/06 Foreign Application Priority Data1999-02-17 DEAbstractA filter material for reducing the content of harmful substances in tobacco smoke. The filter material comprises a ground and not additionally activated expanded clay produced without adding foreign substances, and zeolite as the filter material. The filter is suitable for tobacco products such as cigarettes, cigars and cigarillos, and for smoking articles such as tobacco pipes and cigarette and cigar holders. | |
