Patent US3801428A successfully refreshed from Google Patents.
US3801428A
Expired / Lapsed
US
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Bonded non-woven fibre fleece
Assignee: Bayer AG
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Filing: 1971-09-24
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Granted: 1974-04-02
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Expires: 1991-09-24
Abstract
Abstract A high bulk bonded non-woven fibre fleece containing natural and/or synthetic fibres and binder fibres, which are adhesive at higher temperatures, said binder fibres consisting of a saponified ethylene-vinyl acetate copolymer, the molar ratio of vinyl acetate to ethylene in said copolymer before saponification being in the range of 1:1 to 1:20. In the process to produce the bonded fleece, the fibres containing 5 to 50 percent by weight of binder fibres are formed to a non-woven fleece and the formed fleece is heated to temperatures of above 110* C, to render adhesive the binder fibres.
Inventors
- 👤 H Striegler
- 👤 R Resz
- 👤 H Bartl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:27
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/542; D04H1/546; D04H1/42; D04H1/4266; D04H1/55; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T442/00; Y10T442/60; Y10T442/69
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
High bulk, non-woven fiber fleece comprising 5 to 50 percent by weight, based on the weight of fibers in the fiber fleece, of: (1) a material selected from the group consisting of cotton, regenerated cellulose, wool, acetyl cellulose, polyacrylonitrile, polyester amide, polyamide and polyurethane fibers; and (2) binder fibers, said binder fibers consisting essentially of a saponified ethylene-vinyl acetate copolymer containing vinyl acetate and ethylene in a molar ratio of 1:1 to 1:20 in copolymerized form and which is saponifiEd to a degree of hydrolysis of 50 to 100 percent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |