US3273833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil structure
Assignee: Dow Chemical Co
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Filing: 1965-01-21
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Granted: 1966-09-20
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Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 Leo J Windecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:34
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
AN AIRCRAFT AIRFOIL STRUCTURE WHICH COMPRISES A CORE CONSISTING OF A STRUCTURALLY RIGID FOAM, A MULTIPLICITY OF ELONGATED SPARS RUNNING LONGITUDINALLY THROUGH BORES IN SAID CORE FROM END TO END THEREOF, SAID SPARS BEING SPACED APART AND DISPOSED BETWEEDN 3/8 INCH AND ONE INCH FROM THE OUTER SURFACE OF SAID CORE AND BEING CONTINUOUSLY BONDED TO THE WALLS OF SAID BORES ALONG THE LENGTH OF THE SPARS EXTENDING THROUGH SAID BORES, AND A SKIN, SAID SKIN COVERING SAID CORE AND BEING INTEGRALLY BONDED THERETO.
Claim 2
Dependent Claim
84 words
AN AIRCRAFT AIRFOIL STRUCTURE WHICH COMPRISES A CORE CONSISTING OF A STRUCTURALLY RIGID FOAM, A MULTIPLICITY OF ELONGATED SPARS RUNNING LONGITUDINALLY THROUGH BORES IN SAID CORE FROM END TO END THEREOF, SAID SPARS BEING SPACED APART AND DISPOSED BETWEEDN 3/8 INCH AND ONE INCH FROM THE OUTER SURFACE OF SAID CORE AND BEING CONTINUOUSLY BONDED TO THE WALLS OF SAID BORES ALONG THE LENGTH OF THE SPARS EXTENDING THROUGH SAID BORES, AND A SKIN, SAID SKIN COVERING SAID CORE AND BEING INTEGRALLY BONDED THERETO.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |