US4889763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandwich material and the use thereof
Assignee: SCHREINER LUCHTVAARTGROEP BV A CORP OF NETHERLANDS
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Filing: 1988-10-20
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Granted: 1989-12-26
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Expires: 2008-10-20
Abstract
Abstract Sandwich material comprising at least one layer of a thermoplastic polyetherimide or polyether sulfone foam and a fibre-reinforced layer consisting of a fibrous mat impregnated with thermoplastic polyetherimide or polyether sulfone, applied to at least one surface of said foam.
Inventors
- 👤 Johan A. Brambach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:57
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/31504; Y10T428/31533; Y10T428/31721; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/3341; Y10T442/3366; Y10T442/40; Y10T442/469; Y10T442/60; Y10T442/647; Y10T442/649
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
Sandwich material comprising at least one layer of a thermoplastic polyetherimide or polyether sulfone foam and a fibre-reinforced layer comprising a fibrous mat impregnated with thermoplastic polyetherimide or polyether sulfone, applied to at least one surface of said foam.
Claim 2
Dependent Claim
39 words
Sandwich material comprising at least one layer of a thermoplastic polyetherimide or polyether sulfone foam and a fibre-reinforced layer comprising a fibrous mat impregnated with thermoplastic polyetherimide or polyether sulfone, applied to at least one surface of said foam.
Claim 3
Dependent Claim
20 words
A material as claimed in claim 1 wherein the foam is provided with an impregnated fibrous web on both sides.
Claim 4
Dependent Claim
23 words
A material as claimed in claim 1, including a core layer formed by bonding together at least two layers of said thermoplastic foam.
Claim 5
Dependent Claim
24 words
A material as claimed in claim 3, wherein said core layer comprises at least two layers of thermoplastic foam bonded together through direct contact.
Claim 6
Dependent Claim
26 words
A material as claimed in claim 3, wherein the core layer comprises at least two layers of thermoplastic foam bonded together with a fibrous mat between.
Claim 7
Dependent Claim
25 words
A material as claimed in claim 1, wherein the fibrous mat is a woven fabric, a knitted fabric, a non-woven and/or unidirectionally oriented fibre structure.
Claim 8
Dependent Claim
27 words
A material as claimed in claim 1, wherein the fibres are aramide fibres, carbon fibres, glass fibres or a combination of two or more of these fibres.
Claim 9
Dependent Claim
13 words
A material as claimed in claim 7, wherein the fibres are glass fibres.
Claim 10
Dependent Claim
15 words
A material as claimed in claim 1, wherein the thermoplastic foam is formed in situ.
Claim 11
Dependent Claim
14 words
A material as claimed in claim 1, wherein the thermoplastic foam is polyetherimide foam.
References Cited (Backward Citations)
GB936232A
Cited
FR1362035A
Cited
US3841958A
Cited
FR2192905A1
Cited
FR2198835A1
Cited
US4188428A
Cited
DE2906259A1
Cited
CA1184106A
Cited
GB2147850A
Cited
DE3419142A1
Cited
EP0264495A1
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |