Patent US2950479A successfully refreshed from Google Patents.
US3839136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine felt comprising woven fabric having fibrous batt needled thereto
Assignee: Nordiska Maskinfilt AB
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Filing: 1969-10-03
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Granted: 1974-10-01
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Expires: 1989-10-03
Abstract
Abstract Machine felts comprising a base fabric having a batt needled to one or both sides, the machine felt being suitable for use in the paper, cellulose and asbestos-cement industries, the base fabric having longitudinal spun yarns made of wool and/or synthetic staple fibres or multifilaments and transverse yarns made entirely or partially of plastic monofilaments having preferably a thickness of 0.2-0.6 mm.
Inventors
- 👤 E Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:14
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/08; D21F7/083; D03; D03D; D03D25/00; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3065; Y10T442/3073; Y10T442/3081; Y10T442/3707; Y10T442/3724
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A SHAPE-RETAINING MACHINE FELT, WHICH UNDERGOES REDUCED WIDTH-SHARINKAGE DURING ITS MANUFACTURE, FOR USE IN DEWATERING PRESSES AND OTHER OPERATIONS IN WHICH WATER PENETRATES THE FELT AND IS CARRIED AWAY, COMPRISING: A BASE WOVEN FABRIC OF LONGITUDINAL YARNS SPUN FROM SHORT STAPLE FIBERS SELECTED FROM THE GROUP CONSISTING OF WOOL FIBERS, SYNTHETIC STAPLE LENGTH FIBERS AND BLENDS OF SAID WOOL AND SNYTHETIC STAPLE LENGTH FIBERS, AND OF TRANSVERSE YARNS COMPRISING FINE SYNTHETIC THERMOPLASTIC MONOFILAMENTS HAVING A THICKNESS OF 0.2-0.6 MILLIMETERS, AND, A FIBROUS BATT NEEDLED TO AT LEAST ONE SURFACE OF SAID BASE FABRIC WITH THE FIBERS OF THE BATT PENETRATING INTO THE BASE FABRIC.
Claim 2
Dependent Claim
104 words
A SHAPE-RETAINING MACHINE FELT, WHICH UNDERGOES REDUCED WIDTH-SHARINKAGE DURING ITS MANUFACTURE, FOR USE IN DEWATERING PRESSES AND OTHER OPERATIONS IN WHICH WATER PENETRATES THE FELT AND IS CARRIED AWAY, COMPRISING: A BASE WOVEN FABRIC OF LONGITUDINAL YARNS SPUN FROM SHORT STAPLE FIBERS SELECTED FROM THE GROUP CONSISTING OF WOOL FIBERS, SYNTHETIC STAPLE LENGTH FIBERS AND BLENDS OF SAID WOOL AND SNYTHETIC STAPLE LENGTH FIBERS, AND OF TRANSVERSE YARNS COMPRISING FINE SYNTHETIC THERMOPLASTIC MONOFILAMENTS HAVING A THICKNESS OF 0.2-0.6 MILLIMETERS, AND, A FIBROUS BATT NEEDLED TO AT LEAST ONE SURFACE OF SAID BASE FABRIC WITH THE FIBERS OF THE BATT PENETRATING INTO THE BASE FABRIC.
Claim 3
Dependent Claim
16 words
A machine felt according to claim 1, wherein the monofilaments have spun yarns twisted around them.
Claim 4
Dependent Claim
27 words
A machine felt according to claim 2, wherein the spun yarns are so twisted around the monofilaments that the monofilaments constitute a core in the transverse yarns.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |