Tobacco smoke filtering material
Patent 4729390 Issued on March 8, 1988. Estimated Expiration Date: 
July 31, 2005. 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.
July 31, 2005. 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 References 3417759 3424173 InventorApplicationNo. 06/760802 filed on 07/31/1985US Classes:131/331, SMOKE SEPARATOR OR TREATER131/332, Having a polymer131/343, Plasticizer or adhesive coating131/345Including a cellulose ester or etherExaminersPrimary: Millin, V.Attorney, Agent or FirmInternational ClassesA24D 3/14 (20060101)A24D 3/00 (20060101) AbstractDisclosed are tobacco smoke filtering materials for selectively removing deleterious material from tobacco smoke without at the same time removing desirable smoke vapors which contribute to aroma and taste. The filtering materials comprise a fibrous article, the fibers of which have a coating on the surfaces thereof comprising a compound of the formula ##STR1## wherein R1 is the residue of a straight chain fatty acid having 8-22 carbon atoms and R2 is OH or ##STR2## wherein Ac is an acetyl group. | |
