US4088065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making tobacco smoke filter
Assignee: Liggett Group LLC
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Filing: 1977-04-25
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Granted: 1978-05-09
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Expires: 1997-04-25
Abstract
Abstract This invention relates to a cigarette filter composed of two concentric cylindrical layers of fibrous filter materials, in which the inner cylindrical layer has a lower draw resistance than the outer cylindrical layer, and a method and apparatus for the manufacture thereof.
Inventors
- 👤 Floyd V. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:21
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; Y; Y10; Y10S; Y10S493/00; Y10S493/941
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
In a method of making a filter rod for cigarette filter tips, the steps of generating a first stream composed of fibrous filter material; generating a second stream composed of fibrous filter material; maintaining the first stream of fibrous filter material under a longitudinal tension greater than said second stream during the continued travel of both streams to form a filter rod; placing said streams in juxtaposition during travel while simultaneously enveloping said second stream of fibrous material circumferentially about said first stream of fibrous material; generating a third stream composed of of paper; circumferentially enveloping said third stream about said juxtaposed first and second streams during continued travel of said first, second and third streams to form a filter rod; and moving said rod to continue movement of said three streams while constricting said second stream about said first stream for continued travel therewith.
Claim 2
Dependent Claim
145 words
In a method of making a filter rod for cigarette filter tips, the steps of generating a first stream composed of fibrous filter material; generating a second stream composed of fibrous filter material; maintaining the first stream of fibrous filter material under a longitudinal tension greater than said second stream during the continued travel of both streams to form a filter rod; placing said streams in juxtaposition during travel while simultaneously enveloping said second stream of fibrous material circumferentially about said first stream of fibrous material; generating a third stream composed of of paper; circumferentially enveloping said third stream about said juxtaposed first and second streams during continued travel of said first, second and third streams to form a filter rod; and moving said rod to continue movement of said three streams while constricting said second stream about said first stream for continued travel therewith.
Claim 3
Dependent Claim
41 words
In a method as set forth in claim 1 the steps of folding opposite edges of said paper stream over each other and adhering said edges together after enveloping said paper stream about said juxtaposed streams to form said filter rod.
Claim 4
Dependent Claim
19 words
In a method as set forth in claim 2 wherein both streams of fibrous filter material are cellulose acetate.
Claim 5
Dependent Claim
47 words
In a method as set forth in claim 3 wherein the first stream of fibrous filter material has a dpf value of from about 7 to about 9 and the second stream of fibrous filter material has a dpf value of from about 1 to about 5.
Claim 6
Independent Claim
167 words
An apparatus for making a filter rod for cigarette filter tips comprising means for supplying a first stream of coarse filter fibers; means for applying tension on said first stream during its continued travel; means for supplying a second stream of fine filter fibers in substantial alignment with said first stream; an elongated mandrel having a passageway for receiving and consolidating said first stream fibers, said second stream fibers positioned about the periphery of said mandrel to at least partially envelop the same; means for supplying a stream of wrapping paper; filter rod forming means positioned downstream from said mandrel for receiving said first and second stream fibers and said wrapping paper, said forming means receiving said elongated mandrel and adapted to concentrically surround and frictionally engage said first stream fibers issuing from said mandrel with said second stream fibers and to circumferentially envelop said wrapping paper about said stream of fibers to form a filter rod; and means for cutting said filter rod into predetermined lengths.
Claim 7
Independent Claim
167 words
An apparatus for making a filter rod for cigarette filter tips comprising means for supplying a first stream of coarse filter fibers; means for applying tension on said first stream during its continued travel; means for supplying a second stream of fine filter fibers in substantial alignment with said first stream; an elongated mandrel having a passageway for receiving and consolidating said first stream fibers, said second stream fibers positioned about the periphery of said mandrel to at least partially envelop the same; means for supplying a stream of wrapping paper; filter rod forming means positioned downstream from said mandrel for receiving said first and second stream fibers and said wrapping paper, said forming means receiving said elongated mandrel and adapted to concentrically surround and frictionally engage said first stream fibers issuing from said mandrel with said second stream fibers and to circumferentially envelop said wrapping paper about said stream of fibers to form a filter rod; and means for cutting said filter rod into predetermined lengths.
Claim 8
Dependent Claim
71 words
An apparatus as set forth in claim 5 wherein said forming means includes a forming block for folding the sides of the stream of paper around the streams of filter fibers while compressing the second stream of fibers around the first stream of fibers and a tongue mounted on said forming block to guide the streams of fibers therebetween, and wherein said mandrel projects into said forming means under said tongue.
Claim 9
Dependent Claim
26 words
The apparatus set forth in claim 5 wherein the tensioning means comprises a pair of friction rollers positioned between said first stream supply and said mandrel.
Claim 10
Dependent Claim
20 words
In an apparatus as set forth in claim 7 wherein said mandrel is adjustable with respect to said forming means.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |