Patent US3928696A successfully refreshed from Google Patents.
US3928696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stitched webs of fleeces of synthetic fibers and method of making same
Assignee: Bayer AG
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Filing: 1972-09-07
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Granted: 1975-12-23
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Expires: 1992-09-07
Abstract
Abstract Erosion preventing structural elements in the form of stitched fleeces comprising a fleece from polyamide staple fibers of certain dtex and length, a mesh fabric of synthetic endless yarns and a waterproof binder.
Inventors
- 👤 Martin Wandel
- 👤 Manfred Salamon
- 👤 Gotz Gotmar Dornheim
- 👤 Bernard Kuhlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:39
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/4334; D04H1/44; D04H1/52; D04H1/58; D04H1/593; D04H1/64; D04H1/645; D04H13/00; E; E02; E02B; E02B3/00; E02B3/04; E02B3/12; E02B3/122; E02B3/126; Y; Y02; Y02A; Y02A10/00; Y02A10/30; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24033; Y10T428/24355; Y10T428/24446; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/159
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
AN EROSION PREVENTING STRUCTURAL ELEMENT IN THE FORM OF A STICHED WEB OF FLEECE OF COARSE, CRIMPED FIBERS, CONSISTING OF A WEB OF FLEECE PRODUCED FROM A. CRIMPED POLYAMIDE FIBERS OF DTEX 5 TO 250 AND STAPLE LENGTH 20 TO 150 MM STICHED WITH 60 T 180 STICHES PER CM2, B. A MESH FABRIC OF SYNTHETIC ENDLESS YARNS STICHED INTO THE FLEECE, THE FABRIC HAVING AT LEAST 2 WARP YARNS AND 2 WEFT YARNS PER CM2 AND BEING ARRANGED IN THE LOWER THIRD OF TH WEB O FLEECE, AND C. A WATERPROOF BINDER BASED ON POLYACRYLIC ACID ESTER OF AT LEAST 15% BY WEIGHT, THIS WEB OF FLEECE HAVING A THICKNESS OF 4 TO 10 MM AND A WEIGHT PER M2 OF BETWEEN 500 AND 200 G.
Claim 2
Dependent Claim
127 words
AN EROSION PREVENTING STRUCTURAL ELEMENT IN THE FORM OF A STICHED WEB OF FLEECE OF COARSE, CRIMPED FIBERS, CONSISTING OF A WEB OF FLEECE PRODUCED FROM A. CRIMPED POLYAMIDE FIBERS OF DTEX 5 TO 250 AND STAPLE LENGTH 20 TO 150 MM STICHED WITH 60 T 180 STICHES PER CM2, B. A MESH FABRIC OF SYNTHETIC ENDLESS YARNS STICHED INTO THE FLEECE, THE FABRIC HAVING AT LEAST 2 WARP YARNS AND 2 WEFT YARNS PER CM2 AND BEING ARRANGED IN THE LOWER THIRD OF TH WEB O FLEECE, AND C. A WATERPROOF BINDER BASED ON POLYACRYLIC ACID ESTER OF AT LEAST 15% BY WEIGHT, THIS WEB OF FLEECE HAVING A THICKNESS OF 4 TO 10 MM AND A WEIGHT PER M2 OF BETWEEN 500 AND 200 G.
Claim 3
Dependent Claim
19 words
The erosion preventing structural element of claim 1, said crimped polyamide fibres having 80 to 110 stitches per cm2.
Claim 4
Dependent Claim
72 words
A PROCESS FOR THE PRODUCTION OF EROSION PREVENTING STRUCTURAL ELEMENTS IN THE FORM OF WEBS OF STICHED FLEECE OF SYNTHETIC FIBERS, WHICH COMPRISES LAYING CRIMPED POLYAMIDE STAPLE FIRBRES DTEX 5 TO 250 TO FORM A FLEECE, STICHING TOGETHER THE FORMED FLEECE AND A MESH FABRIC, IMPREGNATING THE RESULTANT COMBINATION WITH A WATERPROOF BINDER BASED ON POLYACRYLATE AND SUBJECTING THE IMPREGNATED FLEECE TO A HEAT TREATMENT AT TEMPERATURES OF BETWEEN 100* AND 150*C.
Claim 5
Dependent Claim
72 words
A PROCESS FOR THE PRODUCTION OF EROSION PREVENTING STRUCTURAL ELEMENTS IN THE FORM OF WEBS OF STICHED FLEECE OF SYNTHETIC FIBERS, WHICH COMPRISES LAYING CRIMPED POLYAMIDE STAPLE FIRBRES DTEX 5 TO 250 TO FORM A FLEECE, STICHING TOGETHER THE FORMED FLEECE AND A MESH FABRIC, IMPREGNATING THE RESULTANT COMBINATION WITH A WATERPROOF BINDER BASED ON POLYACRYLATE AND SUBJECTING THE IMPREGNATED FLEECE TO A HEAT TREATMENT AT TEMPERATURES OF BETWEEN 100* AND 150*C.
Claim 6
Dependent Claim
16 words
The process according to claim 3, in which said binder is applied as an aqueous dispersion.
Claim 7
Dependent Claim
20 words
The process according to claim 4, in which aqueous dispersion of binder contains a filler having a high specific gravity.
Claim 8
Dependent Claim
16 words
The process according to claim 3, In which said laying is achieved by an aerodynamic process.
Claim 9
Dependent Claim
16 words
The process according to claim 3, in which said laying is achieved on a carding machine.
Claim 10
Dependent Claim
20 words
The erosion preventing structural element according to claim 1 which contains 2 to 20% by weight of a wetting agent.
Claim 11
Dependent Claim
40 words
The erosion preventing structural element according to claim 1, wherein said mesh fabric consists of 4 warp yarns and 4 weft yarns of dtex 900 to 1200 per cm2 and has a weight per m2 between 100 and 150 g.
Claim 12
Dependent Claim
24 words
The process according to claim 3, wherein said stitched fleece and mesh fabric combination is impregnated with an aqueous solution of a wetting agent.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |