Glue transfer apparatus for cigarette filters
Patent 4174720 Issued on November 20, 1979. Estimated Expiration Date: 
April 26, 1997. 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.
April 26, 1997. 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 3482488 3550508 3762281 3828658 InventorAssigneeApplicationNo. 05/790949 filed on 04/26/1977US Classes:131/90, With adhesive supply or applier131/342, Including particulate material131/362, Coated or impregnated131/94, Plug attaching or inserting493/47By assembling dissimilar filter materials (e.g., fiber and powdered charcoal, etc.)ExaminersPrimary: Millin, V.Attorney, Agent or FirmInternational ClassesA24D 3/00 (20060101)A24D 3/02 (20060101) AbstractA filter is formed by placing increments of glue in spaced apart relation on a moving stream of plug wrap paper and thereafter depositing alternating fibrous filter sections on the glue increments. Particulate marterial is then deposited between the fibrous filter sections and the plug wrap paper wrapped about the filter sections to form an endless rod. Two-filter filter plugs are severed from the rod by cutting through the unglued fibrous filter section and thereafter the charges of particulate filter material are compacted by moving the unglued outer filter sections of each plug inwardly. Each plug is then joined to two tobacco columns and cut in half. The resultant filters each have a fibrous filter section at the exposed end glued to the plug wrap paper, a compacted particulate section and an unglued fibrous filter section at the tobacco end. | |
