Patent US3900651A successfully refreshed from Google Patents.
US3900651A
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Heavy duty sandwich element
Assignee: Bayer AG
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Filing: 1973-10-31
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Granted: 1975-08-19
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Expires: 1993-10-31
Abstract
Abstract Improved heavy duty sandwich elements having A. A SURFACE LAYER B. A LAYER OF ADHESIVE APPLIED TO THE SURFACE LAYER AND IN WHICH FLOCK FIBERS OF VARYING LENGTHS ARE EMBEDDED, AND C. A FOAM CORE ADJACENT THE ADHESIVE LAYER, INTO WHICH FOAM CORE THE FLOCK FIBERS EXTEND, WITH THE LAYER OF ADHESIVE AND FIBERS; AND WHICH FORMS A MARGINAL ZONE WHEREIN THE FOAM CORE HAS A DENSITY THAT DECREASES CONTINUOUSLY FROM THE MARGINAL ZONE TO THE INTERIOR OF THE FOAM CORE.
Inventors
- 👤 Peter Hoppe
- 👤 Gustav Drouven
- 👤 Martin Wandel
- 👤 Ernst Gutschik
- 👤 Dieter Brokmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:00
CPC Classifications
B; B32; B32B; B32B27/00; B32B5/00; B32B5/18; B32B5/20; B32B15/00; B32B15/04; B32B15/046; B32B15/20; B32B5/22; B32B7/00; B32B7/04; B32B7/12; B32B2260/00; B32B2260/02; B32B2260/021; B32B2305/00; B32B2305/02; B32B2305/022; B32B2419/00; B32B2607/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/23943; Y10T428/23957; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/24996
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
IN A HEAVY DUTY SANDWICH ELEMENT HAVING: A. A SURFACE LAYER B. A LAYER OF ADHESIVE APPLIED TO THE SURFACE LAYER AND HAVING FLOCK FIBERS EMBEDDED THEREIN, AND C. A FOAM CORE ADJACENT THE LAYER OF ADHESIVE AND INTO WHICH FLOCK FIBERS EXTEND, SAID FOAM CORE FORMING A MARGINAL ZONE WITH THE LAYER OF ADHESIVE AND FLOCK FIBERS, THE IMPROVEMENT COMPRISING FLOCK FIBERS OF VARYING LENGTHS WHEREBY THE DENSITY OF THE MARGINAL ZONE OF THE FOAM CORE DECREASES APPROXIMATELY CONTINUOUSLY TO THE INTERIOR OF THE CORE.
Claim 2
Dependent Claim
86 words
IN A HEAVY DUTY SANDWICH ELEMENT HAVING: A. A SURFACE LAYER B. A LAYER OF ADHESIVE APPLIED TO THE SURFACE LAYER AND HAVING FLOCK FIBERS EMBEDDED THEREIN, AND C. A FOAM CORE ADJACENT THE LAYER OF ADHESIVE AND INTO WHICH FLOCK FIBERS EXTEND, SAID FOAM CORE FORMING A MARGINAL ZONE WITH THE LAYER OF ADHESIVE AND FLOCK FIBERS, THE IMPROVEMENT COMPRISING FLOCK FIBERS OF VARYING LENGTHS WHEREBY THE DENSITY OF THE MARGINAL ZONE OF THE FOAM CORE DECREASES APPROXIMATELY CONTINUOUSLY TO THE INTERIOR OF THE CORE.
Claim 3
Dependent Claim
20 words
The sandwich element of claim 1, wherein the flock fibers have diameters that vary with the length of the fibers.
Claim 4
Dependent Claim
14 words
The sandwich element of claim 1, wherein the flock fibers have locally differing densities.
Claim 5
Dependent Claim
15 words
The sandwich element of claim 1, wherein the flock fibers have local variations in length.
Claim 6
Dependent Claim
17 words
The sandwich element of claim 1, wherein the quantity of flock fibers is 30 to 1200 g/m2.
Claim 7
Dependent Claim
17 words
The sandwich element of claim 1, wherein the flock fibers are synthetic, organic, natural or metallic fibers.
Claim 8
Dependent Claim
18 words
The sandwich element of claim 1, wherein at least a part of the flock fibers are crimped fibers.
Claim 9
Dependent Claim
21 words
The sandwich element of claim 1, wherein the interior of the foam core is reinforced with a high bulk fibrous structure.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |