US4323622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-elasticity press felt
Assignee: Albany International Corp
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Filing: 1979-07-17
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Granted: 1982-04-06
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Expires: 1999-07-17
Abstract
Abstract A high-elasticity dewatering felt for use in e.g. papermaking and cellulose machines wherein the elastic properties of the felt are obtained by admixture thereinto of high-molecular thermoplastic elastomer materials, alternatively high-molecular cross-linked urethane-based elastomer materials, which elastomer materials are capable of stretching to at least twice their original length and subsequently, after relief of the load thereon, rapidly return to substantially their original length.
Inventors
- 👤 Arne I. L. Gladh
- 👤 Eric W. Grondahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:24
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/435; D04H1/4358; D04H1/44; D04H1/46; D21; D21F; D21F1/00; D21F1/0027; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10S; Y10S428/00; Y10S428/909; Y10T; Y10T442/00; Y10T442/50; Y10T442/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A dewatering felt of needled textile fibre material for use in the press section of paper-making machines, cellulose machines and similar machines, characterised in that said material comprises high-molecular thermoplastic elastomer fibres which may be stretched to at least twice their original length and thereafter, after relief of the load thereon, rapidly return to essentially their original length.
Claim 2
Dependent Claim
58 words
A dewatering felt of needled textile fibre material for use in the press section of paper-making machines, cellulose machines and similar machines, characterised in that said material comprises high-molecular thermoplastic elastomer fibres which may be stretched to at least twice their original length and thereafter, after relief of the load thereon, rapidly return to essentially their original length.
Claim 3
Dependent Claim
18 words
A dewatering felt as claimed in claim 1, characterised in that the thermoplastic elastomer fibres are urethane-based polymers.
Claim 4
Dependent Claim
18 words
A dewatering felt as claimed in claim 1, characterised in that the thermoplastic elastomer fibres are ester-based polymers.
Claim 5
Dependent Claim
18 words
A dewatering felt as claimed in claim 1, characterised in that the thermoplastic elastomer fibres are styrene-based polymers.
Claim 6
Dependent Claim
17 words
A dewatering felt as claimed in claim 1, characterised in that the thermoplastic fibres are olefine-based polymers.
Claim 7
Dependent Claim
19 words
A dewatering felt as claimed in any of the preceding claims characterised in that the elastomer fibres form threads.
Claim 8
Dependent Claim
22 words
A dewatering felt as claimed in claim 6, characterised in that the elastomer fibres are included as one component of bicomponent fibres.
Claim 9
Dependent Claim
29 words
A dewatering felt as claimed in claim 1, comprising a batt and base structure characterised in that the elastomer material is included in the batt of the needled felt.
Claim 10
Dependent Claim
31 words
A dewatering felt as claimed in claim 1, comprising a batt and a base structure characterised in that the elastomer material is included in the base structure of the needled felt.
Claim 11
Dependent Claim
55 words
A dewatering felt as claimed in claim 1, comprising a batt and a base structure, characterised in that the elastomer material of the base structure of the felt amounts to at least 15 percent by weight of the base structure and to at least 10 percent by weight of the total weight of the felt.
Claim 12
Dependent Claim
55 words
A dewatering felt of needled textile fibre material for use in the press section of paper-making machines, characterised in that said material comprises high-molecular cross-linked urethane-based elastomer fibres which are capable of being stretched to at least twice their length and thereafter, after relief of the load thereon, rapidly return to substantially their original length.
Claim 13
Dependent Claim
55 words
A dewatering felt of needled textile fibre material for use in the press section of paper-making machines, characterised in that said material comprises high-molecular cross-linked urethane-based elastomer fibres which are capable of being stretched to at least twice their length and thereafter, after relief of the load thereon, rapidly return to substantially their original length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |