US3573144A
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US
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Sandwich panel type structural elements and method of making same
Assignee: RALPH A ANDERSEN
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Filing: 1969-08-11
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Granted: 1971-03-30
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Expires: 1989-08-11
Abstract
Abstract A STRUCTURAL ELEMENT OF THE SANDWICH PANEL TYPE. THE CORE IS NOVELLY FORMED BY INTERWEAVING RESIN-IMPREGNATED GLASS CLOTH WEBS AND RIGID SPACER BLOCKS. THE CORE HAS MULTIPLE GLASS CLOTH WEBS, EACH WITH MULTIPLE BLOCK SUPPORTED CORRUGATIONS, WHICH CORRUGATIONS ARE ADJACENTLY OFFSET. THIS CORE PROVIDES ADVANTAGEOUS STRENGTH PROPERTIES TO THE ELEMENT, SPECIFICALLY HIGH STRENGTH-TO-WEIGHT RATIOS, AND, AS WELL, LARGE AREAS FOR BONDING ELEMENT FACE SHEETS TO THE CORE.
Inventors
- 👤 Ralph A Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:02
CPC Classifications
E; E04; E04F; E04F15/00; E04F15/02; E04F15/10; B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/345; B29D; B29D99/00; B29D99/001; B29D99/0021; B29D99/0057; B62; B62D; B62D29/00; B62D29/04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; E04C2/26; E04C2/284; B29L; B29L2009/00; B29L2031/00; B29L2031/30; B29L2031/3005; B29L2031/3017; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/24; Y10T428/24174; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249991; Y10T428/249992
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |