Patent US3129908A successfully refreshed from Google Patents.
US3129908A
Expired / Lapsed
US
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Device for selectively altering lift characteristics of an airfoil
Assignee: Individual
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Filing: 1961-08-25
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Granted: 1964-04-21
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Expires: 1981-08-25
Abstract
No abstract record available.
Inventors
- 👤 Richard G Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:32
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/38; B64C3/44; B64C3/46; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN AN AIRCRAFT INCLUDING AN AIRFOIL SURFACE OF PREDETERMINED NORMAL CAMBER, AN APPARATUS FOR ALTERING THE AIRFOIL CONFIGURATION TO INCREASE THE CAMBER THEREOF FOR SECURING GREATER LIFT AT HIGH ANGLES OF ATTACK, SAID APPARATUS COMPRISING AN EXTENSIBLE DEVICE MOUNTED ON THE AIRFOIL IN THE ZONE OF GREATEST DEPARTURE OF THE CURVATURE OF THE AIRFOIL FROM THE CHORD THEREOF, SAID DEVICE COMPRISING AN INFLATABLE DIAPHRAGM OF TEARDROP SHAPE CONSTRUCTED TO FORM WHEN INFLATED AN AIRFOIL EXTENSION OF SMOOTHLY CURVED DOME-LIKE TEARDROP CONFIGURATION HAVING ITS LONGITUDINAL AXIS IN THE DIRECTION OF NORMAL AIR FLOW OVER THE AIRFOIL SURFACE, AND SHAPING MEANS FOR CONTROLLING THE CONFIGURATION OF SAID DIAPHRAGM IN ITS DEFLATED CONDITION TO MINIMIZE DRAG DURING NORMAL FLIGHT OF THE AIRCRAFT.
Claim 2
Dependent Claim
119 words
IN AN AIRCRAFT INCLUDING AN AIRFOIL SURFACE OF PREDETERMINED NORMAL CAMBER, AN APPARATUS FOR ALTERING THE AIRFOIL CONFIGURATION TO INCREASE THE CAMBER THEREOF FOR SECURING GREATER LIFT AT HIGH ANGLES OF ATTACK, SAID APPARATUS COMPRISING AN EXTENSIBLE DEVICE MOUNTED ON THE AIRFOIL IN THE ZONE OF GREATEST DEPARTURE OF THE CURVATURE OF THE AIRFOIL FROM THE CHORD THEREOF, SAID DEVICE COMPRISING AN INFLATABLE DIAPHRAGM OF TEARDROP SHAPE CONSTRUCTED TO FORM WHEN INFLATED AN AIRFOIL EXTENSION OF SMOOTHLY CURVED DOME-LIKE TEARDROP CONFIGURATION HAVING ITS LONGITUDINAL AXIS IN THE DIRECTION OF NORMAL AIR FLOW OVER THE AIRFOIL SURFACE, AND SHAPING MEANS FOR CONTROLLING THE CONFIGURATION OF SAID DIAPHRAGM IN ITS DEFLATED CONDITION TO MINIMIZE DRAG DURING NORMAL FLIGHT OF THE AIRCRAFT.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |