Patent US3571870A successfully refreshed from Google Patents.
US3571870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of crimped tow for cigarette filters
Assignee: Akzo Nobel UK PLC
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Filing: 1969-03-14
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Granted: 1971-03-23
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Expires: 1989-03-14
Abstract
Abstract Vertically crimped cellulose acetate tow of 25,000-100,000 denier, suitable for cigarette filters, is made by feeding a band of cellulose acetate filaments in which the filaments have a denier of about 1.5 to about 10, are substantially parallel to one another and are adhered to one another, the band being not more than about 6 filament diameters thick, to a stuffing box crimper having an opening wide enough to accommodate the tow and not more than three-sixteenths inches high.
Inventors
- 👤 Olaf George Dixon
- 👤 Margaret Patricia Dixon
- 👤 John Fagge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:44
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
A process as claimed in claim 1 in which the height of the opening of the stuffing-box crimper is one-eighth of an inch.
Claim 2
Dependent Claim
25 words
The process as claimed in claim 1 in which filaments are caused to adhere to one another by moistening the band of filaments with water.
Claim 3
Dependent Claim
50 words
The process claimed in claim 1 and comprising passing the band between a pair of feed rollers prior to delivering it to the stuffer box and maintaining the nip pressure in said feed rollers at a level sufficient to cause adjacent filaments in said band to adhere to one another.
Claim 4
Dependent Claim
47 words
The process claimed in claim 1 and comprising applying a plasticizer to the filaments and passing the band of filaments between a pair of feed rollers prior to delivering it to the stuffer box, to cause the adjacent filaments in said band to adhere to one another.
Claim 5
Dependent Claim
45 words
The process clAimed in claim 1 and comprising contacting the band with steam to soften the filaments thereof and passing the band between a pair of feed rollers prior to delivering it to the stuffer box, to cause adjacent filaments to adhere to one another.
References Cited (Backward Citations)
US2793418A
Cited
GB962516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |