US3948722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warp knitted paper maker's felt and method for the production thereof
Assignee: Scapa Blackburn Ltd
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Filing: 1974-07-29
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Granted: 1976-04-06
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Expires: 1994-07-29
Abstract
Abstract A dimensionally stable warp knitted paper maker's felt includes a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier. Laid-in yarns and/or resin may be used to impart the desired stability to the felt.
Inventors
- 👤 John Brian Wheeldon
- 👤 David Gill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:07
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D04; D04B; D04B21/00; D04B21/14; D04B21/16; Y; Y10; Y10S; Y10S162/00; Y10S162/90; Y10T; Y10T442/00; Y10T442/40; Y10T442/45; Y10T442/456
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
55 words
In a paper making machine having a paper maker's felt therein for supporting paper during the manufacture of the paper, the improvement comprising a dimensionally stable warp knitted paper maker's felt, said warp knitted paper maker's felt including a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier.
Claim 2
Dependent Claim
55 words
In a paper making machine having a paper maker's felt therein for supporting paper during the manufacture of the paper, the improvement comprising a dimensionally stable warp knitted paper maker's felt, said warp knitted paper maker's felt including a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier.
Claim 3
Dependent Claim
34 words
A paper maker's felt as claimed in claim 1, wherein a resin finish is on said felt to impove the structural stability thereof while providing resistance of the felt to chemical and/or heat degradation.
Claim 4
Dependent Claim
15 words
A paper maker's felt as claimed in claim 1, wherein the yarns comprise multifilament yarns.
Claim 5
Dependent Claim
15 words
A paper maker's felt as claimed in claim 1, wherein the yarns comprise staple yarns.
Claim 6
Dependent Claim
15 words
A paper maker's felt as claimed in claim 1, wherein the yarns comprise monofilament yarns.
Claim 7
Dependent Claim
69 words
In a paper making machine having a paper maker's felt therein for supporting paper during the manufacture of the paper, the improvement comprising a dimensionally stable warp knitted paper maker's felt, said warp knitted paper maker's felt including a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier, and said felt being resin treated to improve the structural stability of the felt.
Claim 8
Dependent Claim
69 words
In a paper making machine having a paper maker's felt therein for supporting paper during the manufacture of the paper, the improvement comprising a dimensionally stable warp knitted paper maker's felt, said warp knitted paper maker's felt including a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier, and said felt being resin treated to improve the structural stability of the felt.
Claim 9
Dependent Claim
86 words
In a paper making machine having a paper maker's felt therein for supporting paper during the manufacture of the paper, the improvement comprising a dimensionally stable warp knitted paper maker's felt, said warp knitted paper maker's felt including a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier, and a plurality of substantially straight yarns laid-in in at least one of the warp and weft directions to impart at least a part of the desired stability to the felt.
Claim 10
Dependent Claim
86 words
In a paper making machine having a paper maker's felt therein for supporting paper during the manufacture of the paper, the improvement comprising a dimensionally stable warp knitted paper maker's felt, said warp knitted paper maker's felt including a plurality of interlocked yarns having a weight per unit length equivalent to at least 500 denier, and a plurality of substantially straight yarns laid-in in at least one of the warp and weft directions to impart at least a part of the desired stability to the felt.
Claim 11
Dependent Claim
18 words
A paper maker's felt as claimed in claim 7, wherein the straight yarns extend in the warp direction.
Claim 12
Dependent Claim
23 words
A paper maker's felt as claimed in claim 7, wherein a resin finish is on said felt to improve the structural stability thereof.
Claim 13
Independent Claim
64 words
The method of producing a paper maker's felt, including the steps of warp knitting yarns to provide a warp knitted fabric, said yarns including yarns of at least 500 denier, treating said fabric to yender it dimensionally stable in at least one of the warp and weft directions, and using said warp knitted fabric as a paper maker's felt in a paper making machine.
Claim 14
Independent Claim
64 words
The method of producing a paper maker's felt, including the steps of warp knitting yarns to provide a warp knitted fabric, said yarns including yarns of at least 500 denier, treating said fabric to yender it dimensionally stable in at least one of the warp and weft directions, and using said warp knitted fabric as a paper maker's felt in a paper making machine.
Claim 15
Dependent Claim
27 words
The method as claimed in claim 10 including the step of laying in straight weft yarns during knitting thereby to impart a structural stability to the fabric.
Claim 16
Dependent Claim
22 words
The method as claimed in claim 10 including the step of including straight yarns extending in the warp direction thereof during knitting.
Claim 17
Dependent Claim
31 words
The method as claimed in claim 10 wherein the treating step includes resin treating the fabric to improve the structural stability thereof while providing a chemical and/or heat degradation resistance thereto.
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |