Patent US3174222A successfully refreshed from Google Patents.
US4069563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making nonwoven fabric
Assignee: EIDP Inc
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Filing: 1976-04-02
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Granted: 1978-01-24
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Expires: 1996-04-02
Abstract
Abstract The tensile strength of nonwoven fabric made by traversing a fibrous web on an apertured support with fine columnar streams of liquid is increased when the fine columnar streams are divided up into an array of a plurality of rows of streams, instead of a single row, with the streams in each row being staggered from one another and the rows being spaced 10 to 80 mils apart.
Inventors
- 👤 Rashmikant Maganlal Contractor
- 👤 Birol Kirayoglu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:49
CPC Classifications
D; D04; D04H; D04H18/00; D04H18/04; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/492
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
In the process of impinging a row of fine columnar streams of liquid onto a fibrous web of staple fibers supported on an apertured support passing therebeneath to produce by fiber entanglement a patterned nonwoven fabric, the improvement comprising impinging said streams onto said web as an array of streams in a plurality of rows in which the streams are staggered from row to row, said streams being spaced apart sufficiently to provide an increase in tensile strength of said fabric and space close enough together to avoid substantially changing the pattern in the fabric, both as compared to when all said streams are in a single row, the spacing between said rows being from 0.254 to 2.032 mm.
Claim 2
Dependent Claim
119 words
In the process of impinging a row of fine columnar streams of liquid onto a fibrous web of staple fibers supported on an apertured support passing therebeneath to produce by fiber entanglement a patterned nonwoven fabric, the improvement comprising impinging said streams onto said web as an array of streams in a plurality of rows in which the streams are staggered from row to row, said streams being spaced apart sufficiently to provide an increase in tensile strength of said fabric and space close enough together to avoid substantially changing the pattern in the fabric, both as compared to when all said streams are in a single row, the spacing between said rows being from 0.254 to 2.032 mm.
Claim 3
Dependent Claim
18 words
In the process of claim 1 wherein said streams have an angle of divergence of less than 3°.
Claim 4
Dependent Claim
18 words
In the process of claim 1 wherein said streams have an angle of divergence of less than 1°.
Claim 5
Dependent Claim
13 words
In the process of claim 1 wherein said fabric has an apertured pattern.
Claim 6
Dependent Claim
13 words
In the process of claim 1 wherein said fabric has a jet-tracked pattern.
Claim 7
Dependent Claim
20 words
In the process of claim 1 wherein each row of said plurality of rows has from 10 to 35 streams/inch.
Claim 8
Dependent Claim
16 words
In the process of claim 1 wherein said rows are from 0.38 to 1.27 mm apart.
Claim 9
Dependent Claim
25 words
In the process of claim 1 wherein the orifices for said columnar streams impinging onto said fibrous web are 0.0762 to 0.254 mm in diameter.
Claim 10
Dependent Claim
20 words
In the process of claim 1 wherein the improvement includes impinging said streams onto both sides of said fibrous web.
References Cited (Backward Citations)
US3493462A
Cited
US3333315A
Cited
US3498874A
Cited
US3485706A
Cited
US4021284A
Cited
US4024612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |