Patent US3574447A successfully refreshed from Google Patents.
US3574447A
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Multicurved reflector
Assignee: Goodyear Aerospace Corp
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Filing: 1969-02-17
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Granted: 1971-04-13
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Expires: 1989-02-17
Abstract
Abstract The invention relates to a reflecting surface with a prescribed complex curvature achieved without the use of internal pressurization-, inflation-, or rigidization-dependent techniques. The reflector is a one-sheet hyperboloid or some other similar smoothly varying curved sheet containing both convex and concave elements at every point on its surface. The surface is achieved by the proper tensioning and positioning of the sheet around its periphery.
Inventors
- 👤 Fredrick R Ruble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:58
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/16; H01Q15/161; G; G02; G02B; G02B5/00; G02B5/08; G02B5/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A reflector which comprises: a large reflective surface of generally hyperbolic configuration; and a frame to support and stretch the surface by attachment only at points on the periphery of the surface, where the majority of attachment points are at a given level and at least a pair of substantially opposed points is above said level and at least a pair of substantially opposed points is below said level, whereby the surface is stretched to form a single sheet which has both concave and convex elements at every point.
Claim 2
Dependent Claim
89 words
A reflector which comprises: a large reflective surface of generally hyperbolic configuration; and a frame to support and stretch the surface by attachment only at points on the periphery of the surface, where the majority of attachment points are at a given level and at least a pair of substantially opposed points is above said level and at least a pair of substantially opposed points is below said level, whereby the surface is stretched to form a single sheet which has both concave and convex elements at every point.
Claim 3
Dependent Claim
23 words
A reflector according to claim 1 where the reflective surface is formed with a catenary between each point of attachment to the frame.
Claim 4
Dependent Claim
53 words
A reflector according to claim 1 where the attachment points are opposite to each other and the majority of opposite attachment points are at the same level, with respect to the frame, but where at least one pair of opposite points is above and another pair of opposite points is below such level.
Claim 5
Dependent Claim
23 words
A reflector according to claim 3 where the pairs of points above and below such level are at 90* spacing from each other.
References Cited (Backward Citations)
US1683270A
Cited
US3360798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |