Patent US3589956A successfully refreshed from Google Patents.
US3589956A
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US
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Process for making a thermally self-bonded low density nonwoven product
Assignee: EIDP Inc
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Filing: 1967-09-22
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Granted: 1971-06-29
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Expires: 1987-09-22
Abstract
Abstract A LOW DENSITY FIBROUS NONWOVEN PRODUCT IS MADE BY (A) SPINNING BICOMPONENT FIBERS, (B) CUTTING, CRIMPING, AND ANEALING THE FIBERS, (C) FORMING THE FIBERS INTO A LOW DENSITY NONWOVEN ASSEMBLY, (D) HEATING THE ASSEMBLY TO BOND THE FIBERS, AND (E) COOLING. CURRING, CRIMPING, AND ANNEALING MAY BE CARRIED OUT IN VARIOUS ORDERS, DEPENDING UPON THE NATURE OF THE BICOMPONENT FIBER. ANNEALING IS NECESSARY TO REMOVE MOST OF THE LATENT CRIMPING AND PREVENT COMPACTION AND DENSIFICATION OF THE ASSEMBLY DURING STEP (D).
Inventors
- 👤 William Kranz
- 👤 William Lester Stump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:07
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D01; D01F; D01F8/00; D01F8/04; D01F8/14; D04H1/04; D04H1/06; Y; Y10; Y10S; Y10S148/00; Y10S148/012; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |