US4421813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coverstock fabrics
Assignee: Imperial Chemical Industries Ltd
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Filing: 1981-06-15
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Granted: 1983-12-20
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Expires: 2001-06-15
Abstract
Abstract A coverstock fabric comprising an area-bonded non-woven fabric containing a plurality of homofilament staple fibres and a plurality of heterofilament staple fibres, the fabric having a soak through less than 3.5 seconds, a re-wet moisture less than 0.2 grams and a K factor less than 0.6 and preferably less than 0.4.
Inventors
- 👤 Graham Athey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; A; A61; A61F; A61F13/00; A61F13/15; A61F13/51; A61F13/511; A61F13/51121; D04H1/541; D04H1/5412; D04H1/542; D04H1/55; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T442/00; Y10T442/60; Y10T442/637; Y10T442/641
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A coverstock fabric comprising an area-bonded non-woven fabric containing a plurality of homofilament staple fibres comprising polyethylene terephthalate and a plurality of heterofilament staple fibres comprising a core of polyethylene terephthalate and a sheath of polyethylene isophthalate/polyethylene terephthalate copolymer, the fabric having a soakthrough less than 3.5 seconds, a re-wet moisture less than 0.2 grams and a K factor less than 0.6.
Claim 2
Dependent Claim
62 words
A coverstock fabric comprising an area-bonded non-woven fabric containing a plurality of homofilament staple fibres comprising polyethylene terephthalate and a plurality of heterofilament staple fibres comprising a core of polyethylene terephthalate and a sheath of polyethylene isophthalate/polyethylene terephthalate copolymer, the fabric having a soakthrough less than 3.5 seconds, a re-wet moisture less than 0.2 grams and a K factor less than 0.6.
Claim 3
Dependent Claim
15 words
A coverstock fabric as claimed in claim 1 having a K factor less than 0.4.
Claim 4
Dependent Claim
28 words
A coverstock fabric as claimed in claim 1 containing from 75% to 45% of the homofilament staple fibres and from 25% to 55% of the heterofilament staple fibres.
Claim 5
Dependent Claim
26 words
A coverstock fabric as claimed in claim 1 in which both the homofilament staple fibres and the heterofilament staple fibres have a decitex less than 3.
Claim 6
Dependent Claim
28 words
A coverstock fabric as claimed in claim 4 in which both the homofilament staple fibres and the heterofilament staple fibres have a decitex of between 1.5 and 2.
Claim 7
Dependent Claim
17 words
A coverstock fabric as claimed in claim 1 having a weight/area ratio not exceeding 30 grams/square meter.
References Cited (Backward Citations)
US3595731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |