US3890108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural panel bent from laminated honeycomb
Assignee: Raytheon Co
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Filing: 1973-04-16
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Granted: 1975-06-17
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Expires: 1993-04-16
Abstract
Abstract A sandwich composite panel of other than flat configuration is bent from a flat panel by employing a brake-forming operation. The corners of the bent structural panel are shaped so that the inner and outer skins have substantially the same surface length in the bent panel as in the flat sheet. Thus, the sandwich laminate on either side of the bend is undeformed. In the resultant bent structural panel, the surface length of each of the inner and outer skins is substantially the same and is substantially the same as before the bend.
Inventors
- 👤 James W Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/06; B21D11/00; B21D11/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12382; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A STRUCTURAL PANEL FORMED OF A METALLIC INNER SKIN, A METALLIC OUTER SKIN AND A HONEYCOMB CORE POSITIONED BETWEEN SAID INNER AND OUTER SKINS AND SECURED TO BOTH OF SAID SKINS WITH ITS CELLS NORMAL TO SAID SKINS, THE IMPROVEMENT COMPRISING: SAID PANEL HAVING A BEND THEREIN, SAID PANEL BEING SUBSTANTIALLY PLANAR AND DEFINING A FIRST PLANE ON THE FIRST SIDE OF SAID BEND AND BEING SUBSTANTIALLY PLANAR AND DEFINING A SECOND PLANE ON THE SECOND SIDE OF SAID BEND, A FIRST REFERENCE LINE NORMAL TO SAID FIRST PLANE AND A SECND REFERENCE LINE NORMAL TO SAID SECOND PLANE, SAID SKINS BEING CONTINUOUS FROM SAID FIRST TO SAID SECOND REFERENCE LINES, SAID CORE BEING CRUSHED AT SAID BEND BETWEEN SAID
Claim 2
Dependent Claim
120 words
A STRUCTURAL PANEL FORMED OF A METALLIC INNER SKIN, A METALLIC OUTER SKIN AND A HONEYCOMB CORE POSITIONED BETWEEN SAID INNER AND OUTER SKINS AND SECURED TO BOTH OF SAID SKINS WITH ITS CELLS NORMAL TO SAID SKINS, THE IMPROVEMENT COMPRISING: SAID PANEL HAVING A BEND THEREIN, SAID PANEL BEING SUBSTANTIALLY PLANAR AND DEFINING A FIRST PLANE ON THE FIRST SIDE OF SAID BEND AND BEING SUBSTANTIALLY PLANAR AND DEFINING A SECOND PLANE ON THE SECOND SIDE OF SAID BEND, A FIRST REFERENCE LINE NORMAL TO SAID FIRST PLANE AND A SECND REFERENCE LINE NORMAL TO SAID SECOND PLANE, SAID SKINS BEING CONTINUOUS FROM SAID FIRST TO SAID SECOND REFERENCE LINES, SAID CORE BEING CRUSHED AT SAID BEND BETWEEN SAID
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |