Patent US7934002B2 successfully refreshed from Google Patents.
US3852007A
Expired / Lapsed
US
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Apparatus for making filters
Assignee: Celanese Corp
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Filing: 1972-03-24
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Granted: 1974-12-03
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Expires: 1992-03-24
Abstract
Abstract Improved tobacco smoke filters, particularly cigarette filters, are prepared from a web of synthetic polymeric fibers having applied to at least one surface thereof a film-forming derivative of cellulose. Continuous processes and apparatus for the production of the web and filter are also described.
Inventors
- 👤 W Levers
- 👤 C Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:47
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0204; A24D3/0212; A24D3/022
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
An apparatus for preparing improved cigarette filters comprising a supply means for providing a web of synthetic thermoplastic organic fibers having at least one surface thereof impregnated with a film-forming derivative of cellulose which renders the web stiff, flexing and fracturing means for receiving, flexing and fracturing said film-forming derivative of cellulose on said web, patterning means for embossing said web, plasticizing means for applying a plasticizer to at least one surface of the flexed and embossed web, which plasticizer means softens the fractured web and means for converting the plasticized web into a substantially cylindrical tobacco smoke filter rod.
Claim 2
Independent Claim
100 words
An apparatus for preparing improved cigarette filters comprising a supply means for providing a web of synthetic thermoplastic organic fibers having at least one surface thereof impregnated with a film-forming derivative of cellulose which renders the web stiff, flexing and fracturing means for receiving, flexing and fracturing said film-forming derivative of cellulose on said web, patterning means for embossing said web, plasticizing means for applying a plasticizer to at least one surface of the flexed and embossed web, which plasticizer means softens the fractured web and means for converting the plasticized web into a substantially cylindrical tobacco smoke filter rod.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 additionally comprising stretching means positioned after said flexing means for transversely stretching said web.
Claim 4
Dependent Claim
56 words
The apparatus of claim 1 additionally comprising patterning means after said flexing means for impressing a patterned configuration into at least one surface of said web, said patterning means comprising a pair of circumferentially or helically grooved rolls having 5 to 80 grooves per inch, said grooves being from about 0.035 to 0.005 inch in depth.
Claim 5
Dependent Claim
25 words
The apparatus of claim 1 wherein said flexing means comprises a plurality of roll pairs at least one roll of each pair being circumferentially grooved.
Claim 6
Dependent Claim
31 words
The apparatus of claim 1 additionally including liquid applicator means for applying a film-forming derivative of cellulose in liquid form to said web and drying means for drying said applied cellulose.
Claim 7
Dependent Claim
12 words
The apparatus of claim 1 wherein the patterning means are heated rolls.
Claim 8
Dependent Claim
27 words
The apparatus of claim 3 wherein said grooved rolls have substantially rectangular groovEs, wherein the angle from the vertical of the groove walls is 0* to 30*.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |