US3952121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Felted web and method of making the same
Assignee: Rontex America Inc
•
Filing: 1973-08-08
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Granted: 1976-04-20
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Expires: 1993-08-08
Abstract
Abstract A continuous fabric tubing is prepared by helically winding non-woven webs on a rotating drum in partly overlapping relationship, stitching the partly superimposed turns to each other by needling, and axially pulling the tubing so formed from the drum. The take-up mechanism, which pulls the tubing from the drum, rotates with the drum, and an automatic cut-off mechanism may be provided for automatically cutting the continuous tubing to uniform, adjustable lengths. The tubing may consist entirely of monofilaments and other smooth fibers not capable of normal felting.
Inventors
- 👤 Richard Dilo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:07
CPC Classifications
D; D04; D04H; D04H18/00; D04H1/00; D04H1/70; D04H1/76; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1362; Y10T442/00; Y10T442/60; Y10T442/682
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
Tubing consisting of a plurality of needled helically wound coaxial turns of at least one fibrous web of non-woven fabric, each turn overlapping at least one preceding turn and being overlapped by at least one succeeding turn, a plurality of fibers integral with each turn angularly extending from said turn inwardly through at least one subjacent turn, said turns being fastened to each other by said angularly inwardly extending fibers.
Claim 2
Dependent Claim
70 words
Tubing consisting of a plurality of needled helically wound coaxial turns of at least one fibrous web of non-woven fabric, each turn overlapping at least one preceding turn and being overlapped by at least one succeeding turn, a plurality of fibers integral with each turn angularly extending from said turn inwardly through at least one subjacent turn, said turns being fastened to each other by said angularly inwardly extending fibers.
Claim 3
Dependent Claim
54 words
Tubing consisting of a plurality of needled coaxial overlapping turns of at least one fibrous web of non-woven fabric, a plurality of fibers integral with each turn extending from said turn inwardly at various angles through at least one subjacent turn, said turns being fastened to each other by said angularly inwardly extending fibers.
Claim 4
Dependent Claim
54 words
Tubing consisting of a plurality of needled coaxial overlapping turns of at least one fibrous web of non-woven fabric, a plurality of fibers integral with each turn extending from said turn inwardly at various angles through at least one subjacent turn, said turns being fastened to each other by said angularly inwardly extending fibers.
Claim 5
Dependent Claim
14 words
The tubing of claim 1 wherein said non-woven fabric consists essentially of synthetic fibers.
Claim 6
Dependent Claim
14 words
The tubing of claim 1 wherein said non-woven fabric consists essentially of inorganic fibers.
Claim 7
Dependent Claim
14 words
The tubing of claim 2 wherein said non-woven fabric consists essentially of synthetic fibers.
Claim 8
Dependent Claim
14 words
The tubing of claim 2 wherein said non-woven fabric consists essentially of inorganic fibers.
References Cited (Backward Citations)
US1515792A
Cited
US2381184A
Cited
US3020615A
Cited
US3216082A
Cited
US3287786A
Cited
GB1162266A
Cited
US3336554A
Cited
US3615989A
Cited
US3530557A
Cited
US3540096A
Cited
US3508307A
Cited
DE1922827A1
Cited
US3740282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |