Patent US4810733A successfully refreshed from Google Patents.
US3374971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid dynamic drag reduction
Assignee: Trane US Inc
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Filing: 1965-08-02
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Granted: 1968-03-26
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Expires: 1985-08-02
Abstract
Abstract 1,106,938. Boundary layer control. AMERICAN RADIATOR & STANDARD SANITARY CORPORATION. 17 Dec., 1965 [2 Aug., 1965], No. 53579/65. Heading F2R. A vehicle, which may be an aircraft, air cushion vehicle or road vehicle, formed with a bluff rear end face (e.g. a planar trailing edge surface of a supersonic wing or the rear wall of a vehicle body) is formed around the periphery of such rear end face with a slot which extends substantially continuously is connected to a lowpressure plenum chamber whereby boundary layer air is drawn off to reduce the turbulent wake and resulting form drag. Various profiles of slot are described.
Inventors
- 👤 Heskestad Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:00
CPC Classifications
B; B64; B64C; B64C23/00; B62; B62D; B62D35/00; B62D35/001; B62D57/00; B62D57/04; B64C2230/00; B64C2230/04; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE METHOD OF MINIMIZING THE AERODYNAMIC FORM DRAG ON AN AIRCRAFT WING WHICH HAS TOP AND BOTTOM SURFACES AND A FLAT BLUFF TRAILING SURFACE AND WHICH IS MOVING THROUGH AIR AT SUBSONIC VELOCITIES, WHICH CONSISTS OF APPLYING SUCTION THROUGH A SUBSTANTIALLY UNIFORM AND CONTINUOUS SLOT POSITIONED ALONG THE PERIPHERAL EDGE BETWEEN AT LEAST ONE OF SAID TOP AND BOTTOM SURFACES AND SAID BLUFF TRAILING SURFACE, SAID SLOT HAVING AT LEAST ONE ROUNDED EDGE AND BEING CONNECTED THROUGH A CONDUIT OF UNIFORMLY VARYING CROSS-SECTION TO A SOURCE OF SUCTION, AND MAINTAINING SAID SUCTION SO AS TO DRAW AIR OVER SAID ROUNDED EDGE THROUGH SAID SLOT AND SAID CONDUIT TO SAID SOURCE OF SUCTION.
Claim 2
Independent Claim
112 words
THE METHOD OF MINIMIZING THE AERODYNAMIC FORM DRAG ON AN AIRCRAFT WING WHICH HAS TOP AND BOTTOM SURFACES AND A FLAT BLUFF TRAILING SURFACE AND WHICH IS MOVING THROUGH AIR AT SUBSONIC VELOCITIES, WHICH CONSISTS OF APPLYING SUCTION THROUGH A SUBSTANTIALLY UNIFORM AND CONTINUOUS SLOT POSITIONED ALONG THE PERIPHERAL EDGE BETWEEN AT LEAST ONE OF SAID TOP AND BOTTOM SURFACES AND SAID BLUFF TRAILING SURFACE, SAID SLOT HAVING AT LEAST ONE ROUNDED EDGE AND BEING CONNECTED THROUGH A CONDUIT OF UNIFORMLY VARYING CROSS-SECTION TO A SOURCE OF SUCTION, AND MAINTAINING SAID SUCTION SO AS TO DRAW AIR OVER SAID ROUNDED EDGE THROUGH SAID SLOT AND SAID CONDUIT TO SAID SOURCE OF SUCTION.
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) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |