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US4232574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for providing a cigarette filter with an aeration groove
Assignee: Liggett Group LLC
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Filing: 1977-08-19
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Granted: 1980-11-11
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Expires: 1997-08-19
Abstract
Abstract An apparatus and method is adapted to provide the filter of a cigarette with an annular perpheral groove to enable air to pass directly into the fibrous body of the filter material after passing through apertures in the tipping paper. Ordinary plug wrap paper instead of a high porosity tea bag paper to wrap the fibrous filter material. The annular groove can be formed by a pair of rotating knives and a rotatable spacer with radial cutting edges which rout out material from each filter plug during conveyance of the plug on an alignment drum of a cigarette making machine. Alternatively, a plurality of closely spaced rotating knives which cut through the plug wrap paper only may be used to form a series of closely spaced annular grooves or slits in the filter periphery.
Inventors
- 👤 Floyd V. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:01
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/025; A24D3/0258; A24D3/04; A24D3/043; B; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/14; B26D1/22; Y; Y10; Y10T; Y10T82/00; Y10T82/16; Y10T82/16426; Y10T82/16655; Y10T82/16672; Y10T82/16967; Y10T82/16983
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
115 words
In an apparatus for providing an aeration groove in a filter plug having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, the combination comprising a rotatable filter plug alignment drum having a plurality of peripherally disposed grooves for sequentially receiving and aligning a plurality of filter plugs, a storage drum for sequentially receiving the filter plugs from said alignment drum, and means adjacent said drums for forming at least one peripheral groove in each filter plug to extend through said plug wrap paper and being at least the depth of said plug wrap paper to communicate the exterior of the filter plug with the body of filter material.
Claim 2
Dependent Claim
115 words
In an apparatus for providing an aeration groove in a filter plug having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, the combination comprising a rotatable filter plug alignment drum having a plurality of peripherally disposed grooves for sequentially receiving and aligning a plurality of filter plugs, a storage drum for sequentially receiving the filter plugs from said alignment drum, and means adjacent said drums for forming at least one peripheral groove in each filter plug to extend through said plug wrap paper and being at least the depth of said plug wrap paper to communicate the exterior of the filter plug with the body of filter material.
Claim 3
Dependent Claim
99 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, each said plug having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, wherein the groove extends through the layer of plug wrap paper to communicate the exterior of the filter plug with the body of filter material.
Claim 4
Dependent Claim
99 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, each said plug having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, wherein the groove extends through the layer of plug wrap paper to communicate the exterior of the filter plug with the body of filter material.
Claim 5
Dependent Claim
38 words
The combination as set forth in claim 2 wherein said forming means forms a pair of spaced apart peripheral grooves in each filter plug, each of said grooves being located near a respective end of a filter plug.
Claim 6
Dependent Claim
83 words
In a method of forming aeration groove filters, the steps of conveying a series of filter plugs having a body of entrainment-type fibrous filter material and a layer of plug wrap paper about said body in sequential order past a grooving station, and forming at least one peripheral groove in each filter plug while simultaneously rotating the filter plug during conveyance through said grooving station, said groove extending through the layer of plug wrap paper to communicate with the body of filter material.
Claim 7
Dependent Claim
83 words
In a method of forming aeration groove filters, the steps of conveying a series of filter plugs having a body of entrainment-type fibrous filter material and a layer of plug wrap paper about said body in sequential order past a grooving station, and forming at least one peripheral groove in each filter plug while simultaneously rotating the filter plug during conveyance through said grooving station, said groove extending through the layer of plug wrap paper to communicate with the body of filter material.
Claim 8
Dependent Claim
38 words
In a method as set forth in claim 4 wherein said step of forming includes circumferential cutting of the layer of plug wrap paper to a depth at least equal to the thickness of the plug wrap paper.
Claim 9
Dependent Claim
31 words
In a method as set forth in claim 4 wherein the step of forming includes removal of at least one circumferential strip of the plug wrap paper to form said groove.
Claim 10
Dependent Claim
150 words
In an apparatus for providing an aeration groove in a filter having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, the combination comprising a rotatable filter plug alignment drum having a plurality of peripherally disposed grooves for sequentially receiving and aligning a plurality of filter plugs, a storage drum for sequentially receiving the filter plugs from said alignment drum, and means adjacent said drums for forming at least one peripheral groove in each filter plug being at least the depth of said plug wrap paper, said means including a pair of spaced apart rotatable knives and a rotatable spacer between and spacing said knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said alignment drum and said spacer having a plurality of circumferentially spaced cutting edges for removing material from each filter plug between said knives.
Claim 11
Dependent Claim
150 words
In an apparatus for providing an aeration groove in a filter having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, the combination comprising a rotatable filter plug alignment drum having a plurality of peripherally disposed grooves for sequentially receiving and aligning a plurality of filter plugs, a storage drum for sequentially receiving the filter plugs from said alignment drum, and means adjacent said drums for forming at least one peripheral groove in each filter plug being at least the depth of said plug wrap paper, said means including a pair of spaced apart rotatable knives and a rotatable spacer between and spacing said knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said alignment drum and said spacer having a plurality of circumferentially spaced cutting edges for removing material from each filter plug between said knives.
Claim 12
Dependent Claim
31 words
The combination as set forth in claim 7 wherein said knives and said spacer are mounted for rotation at a speed greater than the speed of rotation of said alignment drum.
Claim 13
Dependent Claim
30 words
The combination as set forth in claim 7 which further comprises a suction means adjacent said alignment drum and said knives for drawing off material removed from a filter plug.
Claim 14
Dependent Claim
117 words
In an apparatus for providing an aeration groove in a filter having a layer of plug wrap paper circumferentially about a body of entrainment-type filter material, the combination comprising a rotatable filter plug alignment drum having a plurality of peripherally disposed grooves for sequentially receiving and aligning a plurality of filter plugs, a storage drum for sequentially receiving the filter plugs from said alignment drum, and means adjacent said drums for forming at least one peripheral groove in each filter plug being at least the depth of said plug wrap paper, said means including a plurality of rotatable knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said alignment drum.
Claim 15
Dependent Claim
117 words
In an apparatus for providing an aeration groove in a filter having a layer of plug wrap paper circumferentially about a body of entrainment-type filter material, the combination comprising a rotatable filter plug alignment drum having a plurality of peripherally disposed grooves for sequentially receiving and aligning a plurality of filter plugs, a storage drum for sequentially receiving the filter plugs from said alignment drum, and means adjacent said drums for forming at least one peripheral groove in each filter plug being at least the depth of said plug wrap paper, said means including a plurality of rotatable knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said alignment drum.
Claim 16
Dependent Claim
22 words
The combination as set forth in claim 10 wherein said plurality of rotatable knives number six within a space of two millimeters.
Claim 17
Dependent Claim
28 words
The combination as set forth in claim 11 wherein said knives are rotatable in unison at a speed greater than the speed of rotation of said alignment drum.
Claim 18
Dependent Claim
71 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, said forming means being rotatable about a fixed axis to remove material from each filter plug.
Claim 19
Dependent Claim
71 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, said forming means being rotatable about a fixed axis to remove material from each filter plug.
Claim 20
Dependent Claim
114 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, said forming means including a pair of spaced apart rotatable knives and a rotatable spacer between and spacing said knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said conveying means and said spacer having a plurality of circumferentially spaced cutting edges for removing material from each filter plug between said knives.
Claim 21
Dependent Claim
114 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, said forming means including a pair of spaced apart rotatable knives and a rotatable spacer between and spacing said knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said conveying means and said spacer having a plurality of circumferentially spaced cutting edges for removing material from each filter plug between said knives.
Claim 22
Dependent Claim
26 words
The combination as set forth in claim 14 which further comprises a suction means adjacent said knives for drawing off material removed from a filter plug.
Claim 23
Dependent Claim
81 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, said means including a plurality of rotatable knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said conveying means.
Claim 24
Dependent Claim
81 words
In an apparatus for forming an aeration groove filter, the combination comprising a conveying means for conveying a series of filter plugs in sequential order past a grooving station, and a forming means adjacent said conveying means at said station for forming at least one peripheral groove in each filter plug conveyed through said station, said means including a plurality of rotatable knives, each said knife having a peripheral cutting edge for cutting into a filter plug on said conveying means.
Claim 25
Dependent Claim
21 words
The combination as set forth in claim 16 wherein said plurality of knives number six within a space of two millimeters.
Claim 26
Dependent Claim
111 words
In an apparatus for providing an aeration groove in a filter plug having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, the combination comprising a rotatable drum having a plurality of peripherally disposed grooves for sequentially receiving and conveying a plurality of filter plugs, a storage means for sequentially receiving the filter plugs from said drum, and means adjacent said drum for forming at least one peripheral groove in each filter plug to extend through said plug wrap paper and being at least the depth of said plug wrap paper to communicate the exterior of the filter plug with the body of filter material.
Claim 27
Dependent Claim
111 words
In an apparatus for providing an aeration groove in a filter plug having a layer of plug wrap paper circumferentially about a body of entrainment-type fibrous filter material, the combination comprising a rotatable drum having a plurality of peripherally disposed grooves for sequentially receiving and conveying a plurality of filter plugs, a storage means for sequentially receiving the filter plugs from said drum, and means adjacent said drum for forming at least one peripheral groove in each filter plug to extend through said plug wrap paper and being at least the depth of said plug wrap paper to communicate the exterior of the filter plug with the body of filter material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |