Patent US3616112A successfully refreshed from Google Patents.
US3616112A
Expired / Lapsed
US
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Balsa wood core in a laminated structural sandwich
Assignee: Balsa Development Corp
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Filing: 1969-08-29
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Granted: 1971-10-26
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Expires: 1989-08-29
Abstract
Abstract A tessellated contour core blanket for use in structural laminates, the blanket being constituted by an array of blocks, preferably of end-grain balsa, adhesively secured to an open mesh scrim, the exposed ends of the blocks being sealed to prevent the admission therein of moisture or resin, whereby the blanket may be stored for prolonged periods without blanket warpage, and the blanket may thereafter be laminated to facing skins without printout effects.
Inventors
- 👤 Ramesh R Desai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/10; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B7/00; B32B7/04; B32B7/12; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; B32B2262/00; B32B2262/10; B32B2262/101; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249959
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
A sandwich as set forth in claim 1, wherein said skins are constituted by a chopped fiber glass mat.
Claim 2
Dependent Claim
16 words
A sandwich as set forth in claim 1, wherein said scrim is of a nonstretchable material.
Claim 3
Dependent Claim
15 words
A sandwich as set forth in claim 3, wherein said scrim is of fiber glass.
Claim 4
Dependent Claim
15 words
A sandwich as set forth in claim 1, wherein said sandwich has a curved profile.
Claim 5
Dependent Claim
31 words
A sandwich as set forth in claim 1, wherein said film is constituted by powder material embedded in the pores at the ends of the block held therein by a binder.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |