Patent US4759976A successfully refreshed from Google Patents.
US4759976A
Expired / Lapsed
US
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Forming fabric structure to resist rewet of the paper sheet
Assignee: Albany International Corp
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Filing: 1987-04-30
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Granted: 1988-07-26
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Expires: 2007-04-30
Abstract
Abstract Forming fabrics are made in multilayer construction, with a hydrophobic top layer and a hydrophilic base layer or layers. The fabric is advantageous in a forming wire, obviating rewet in a forming paper sheet.
Inventors
- 👤 William H. Dutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; Y; Y10; Y10S; Y10S162/00; Y10S162/903; Y10T; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/3195; Y10T442/3203; Y10T442/3211
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
In a papermachine forming fabric which comprises a top layer for contacting the forming paper sheet and an underlying layer for supporting the top layer, said multi-layers each comprising interwoven warp and weft yarns, the improvement, which comprises said top layer being hydrophobic and said underlying layer being hydrophilic.
Claim 2
Dependent Claim
49 words
In a papermachine forming fabric which comprises a top layer for contacting the forming paper sheet and an underlying layer for supporting the top layer, said multi-layers each comprising interwoven warp and weft yarns, the improvement, which comprises said top layer being hydrophobic and said underlying layer being hydrophilic.
Claim 3
Dependent Claim
50 words
A papermachine forming fabric comprising at least two woven plies of respective sets of weft yarns and warp yarns, binder warp yarns interwoven with the interconnecting said two plies, the upper of said plies being fabricated from hydrophobic materials and the lower of said plies being fabricated from hydrophilic materials.
Claim 4
Dependent Claim
50 words
A papermachine forming fabric comprising at least two woven plies of respective sets of weft yarns and warp yarns, binder warp yarns interwoven with the interconnecting said two plies, the upper of said plies being fabricated from hydrophobic materials and the lower of said plies being fabricated from hydrophilic materials.
Claim 5
Dependent Claim
45 words
A papermachine forming fabric, which comprises: a multi-ply fabric, including a top ply and a bottom ply; said top and bottom plies each comprising interwoven warp and weft yarns; said yarns in the top ply being hydrophobic; said yarns in the bottom ply being hydrophilic.
Claim 6
Dependent Claim
45 words
A papermachine forming fabric, which comprises: a multi-ply fabric, including a top ply and a bottom ply; said top and bottom plies each comprising interwoven warp and weft yarns; said yarns in the top ply being hydrophobic; said yarns in the bottom ply being hydrophilic.
Claim 7
Dependent Claim
16 words
The fabric of claim 3 wherein the hydrophobicity of the yarns is due to chemical treatment.
Claim 8
Dependent Claim
15 words
The fabric of claim 3 wherein hydrophilicity of the yarns is due to chemical treatment.
Claim 9
Dependent Claim
12 words
The fabric of claim 3 wherein the yarns are all monofilament yarns.
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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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |