US4764238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy absorbing foam-fabric laminate
Assignee: Grumman Corp
•
Filing: 1987-03-16
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Granted: 1988-08-16
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Expires: 2007-03-16
Abstract
Abstract A lightweight energy-absorbing structure is comprised of a laminate including a plurality of fabrics, pre-impregnated with a thermosetting resin, abutting against a core of cellular foam treated with a charge of filled bonding material. The resulting mixed materials are compressed between two die members while heat is applied to the dies thereby single curing the thermosetting resin and bonding material. Individual sheets of fabric may have a predetermined orientation to increase impact resistance. In a preferred embodiment polyimide open-cell foam may be employed.
Inventors
- 👤 Samuel J. Dastin
- 👤 Carlos M. Cacho-Negrete
- 👤 John Mahon
- 👤 Leonard M. Poveromo
- 👤 Nicholas Corvelli
- 👤 Arnold London
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C70/06; B29C70/08; B29C70/086; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B29K; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/08; B29K2105/0809; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/24132; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249982; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/651
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A method for forming a lightweight laminated structure comprising the steps: impregnating opposite surfaces of a layer of open cellular material with a charge of thermosetting resin; stacking a first plurality of fabric sheets, preimpregnated with bonding material, against a first surface of the cellular layer; wherein each sheet has an altered preselected orientation relative to an adjacently stacked sheet; stacking a second plurality of fabric sheets, preimpregnated with bonding material, against an opposite surface of the cellular layer; wherein each sheet of the second plurality of sheets has an altered preselected orientation relative to an adjacently stacked sheet, but an identical orientation to a corresponding sheet in the first plurality of fabric sheets; subjecting all the sheets and the layer to pressure from die members which bond them together while molding the structure to a predetermined finished contour; and applying heat and the pressure simultaneously for single curing the resin and impregnated material, while molding occurs, to form an impact-resistant structure.
Claim 2
Independent Claim
162 words
A method for forming a lightweight laminated structure comprising the steps: impregnating opposite surfaces of a layer of open cellular material with a charge of thermosetting resin; stacking a first plurality of fabric sheets, preimpregnated with bonding material, against a first surface of the cellular layer; wherein each sheet has an altered preselected orientation relative to an adjacently stacked sheet; stacking a second plurality of fabric sheets, preimpregnated with bonding material, against an opposite surface of the cellular layer; wherein each sheet of the second plurality of sheets has an altered preselected orientation relative to an adjacently stacked sheet, but an identical orientation to a corresponding sheet in the first plurality of fabric sheets; subjecting all the sheets and the layer to pressure from die members which bond them together while molding the structure to a predetermined finished contour; and applying heat and the pressure simultaneously for single curing the resin and impregnated material, while molding occurs, to form an impact-resistant structure.
Claim 3
Dependent Claim
26 words
The method set forth in claim 1 wherein a plurality of spaced cellular layers is individually deposited between alternating first and second pluralities of fabric sheets.
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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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |