Patent US5741574A successfully refreshed from Google Patents.
US5741574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Truss reinforced foam core sandwich
Assignee: Vencore Services and Solutions Inc
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Filing: 1995-05-03
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Granted: 1998-04-21
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Expires: 2015-05-03
Abstract
Abstract A reinforced foam core sandwich structure including opposing face sheets, a foam core therebetween, and tow members encapsulated within the foam core and extending between the opposing face sheets to form a combined foam/tow member core wherein the compressive strength or shear strength of the combined foam/tow member core is greater than the compressive strength or shear strength, respectively, of the foam core alone or the tow members alone forming a support structure within the foam core between the face sheets.
Inventors
- 👤 Joseph Santin Boyce
- 👤 Glenn Alexander Freitas
- 👤 Thomas Gerard Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/569; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/083; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/22; E04C2/26; E04C2/284; E04C2/296; B32B2305/00; B32B2305/02; B32B2305/022; B32B2305/08; B32B2305/10; B32B2305/18; B32B2307/00; B32B2307/50; B32B2307/542; B32B2607/00; B32B38/00; B32B38/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49835; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/23907; Y10T428/23914; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24116; Y10T428/24174; Y10T428/249921; Y10T428/249923; Y10T428/249953; Y10T428/24996; Y10T428/249986
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A reinforced foam core sandwich structure comprising: opposing multi-layer laminate face sheets; a foam core therebetween; and a plurality of discrete supporting tow members encapsulated within said foam core forming a support structure therein, at least a number of said tow member extending into said face sheets to anchor the face sheets to the foam core to form a combined foam/tow member core wherein the compressive strength or shear strength of the combined foam/tow member core is greater than the compressive strength or shear strength, respectively, of the foam core alone or the tow members alone.
Claim 2
Dependent Claim
96 words
A reinforced foam core sandwich structure comprising: opposing multi-layer laminate face sheets; a foam core therebetween; and a plurality of discrete supporting tow members encapsulated within said foam core forming a support structure therein, at least a number of said tow member extending into said face sheets to anchor the face sheets to the foam core to form a combined foam/tow member core wherein the compressive strength or shear strength of the combined foam/tow member core is greater than the compressive strength or shear strength, respectively, of the foam core alone or the tow members alone.
Claim 3
Dependent Claim
36 words
The reinforced foam core sandwich structure of claim 1 in which a number of said tow members form a shear bearing truss structure within said foam core for reinforcing the shear strength of the sandwich structure.
Claim 4
Dependent Claim
20 words
The reinforced foam core sandwich structure of claim 2 in which said truss structure includes a number of X-braced members.
Claim 5
Dependent Claim
24 words
The reinforced foam core sandwich structure of claim 1 in which a number of said tow members are disposed perpendicularly between said face sheets.
Claim 6
Dependent Claim
94 words
A reinforced foam core sandwich structure comprising: opposing face sheets; a foam core therebetween; and a plurality of discrete supporting tow members encapsulated within said foam core forming a support structure therein, at least a number of said tow member extending into said face sheets to anchor the face sheets to the foam core to form a combined foam/tow member core wherein the compressive strength or shear strength of the combined foam/tow member core is greater than the compressive strength or shear strength, respectively, of the foam core alone or the tow members alone.
Claim 7
Dependent Claim
94 words
A reinforced foam core sandwich structure comprising: opposing face sheets; a foam core therebetween; and a plurality of discrete supporting tow members encapsulated within said foam core forming a support structure therein, at least a number of said tow member extending into said face sheets to anchor the face sheets to the foam core to form a combined foam/tow member core wherein the compressive strength or shear strength of the combined foam/tow member core is greater than the compressive strength or shear strength, respectively, of the foam core alone or the tow members alone.
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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) | 2001-04-20 | 2001-10-20 | 2002-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-20 | 2005-10-20 | 2006-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-20 | 2009-10-20 | 2010-04-21 | $7700.00 | Window Closed / Lapsed |