US4357777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihedral aerodynamic structure
Assignee: Individual
•
Filing: 1978-01-03
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Granted: 1982-11-09
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Expires: 1998-01-03
Abstract
Abstract The specification describes an aerodynamic structure having lift for use on an aerodyne. The structure comprises first and second essentially identical planar sections hingedly connected at their roots to one another at dihedral angles. The sections are moveable in unison to vary the angle between each section and its transverse axis.
Inventors
- 👤 Donald A. Kulik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:17
CPC Classifications
A; A63; A63H; A63H27/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
An aerodynamic structure having self-correcting flight properties; said aerodynamic structure comprising first and second corresponding planar sections connected at their roots to one another centrally of the aerodynamic structure by a springy hinging connection and moveable relative to one another through corresponding dihedral angles; each of said sections comprising: a forward wing, a body portion, and a rear empennage moveable in unison with one another and said sections being moveable from a widespread glide position to an essentially folded projectile position in response to dynamic pressures to substantially alter the equilibrium state and stability of the structure during flight.
Claim 2
Dependent Claim
99 words
An aerodynamic structure having self-correcting flight properties; said aerodynamic structure comprising first and second corresponding planar sections connected at their roots to one another centrally of the aerodynamic structure by a springy hinging connection and moveable relative to one another through corresponding dihedral angles; each of said sections comprising: a forward wing, a body portion, and a rear empennage moveable in unison with one another and said sections being moveable from a widespread glide position to an essentially folded projectile position in response to dynamic pressures to substantially alter the equilibrium state and stability of the structure during flight.
Claim 3
Dependent Claim
28 words
An aerodynamic structure as defined in claim 1, wherein each of said sections comprises a large forward wing, a narrow elongated body portion and a small empennage section.
Claim 4
Dependent Claim
27 words
An aerodynamic structure as defined in claim 2, constructed from a single piece of centrally folded lightweight resilient material exerting forces to maintain a predetermined dihedral angle.
Claim 5
Dependent Claim
17 words
An aerodynamic structure as claimed in claim 3, constructed from cardboard and for use as a toy.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |