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US4115486A
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Method of developing an anticlastic concentrator
Assignee: 3M Co
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Filing: 1977-04-25
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Granted: 1978-09-19
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Expires: 1997-04-25
Abstract
Abstract Devices for concentrating radiant energy and having reflective anticlastic surfaces, produced by processes involving shrinking an elastic reflective film onto a rigid frame representing one or a series of twisted squares, or by twisting a semi-rigid elastic reflective panel.
Inventors
- 👤 Charles D. Cowman, Jr.
- 👤 John P. G. Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:46
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/10; B; B29; B29D; B29D11/00; B29D11/00596; F; F24; F24S; F24S23/00; F24S23/70; F24S23/81; Y; Y02; Y02E; Y02E10/00; Y02E10/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
Method of developing a rigid continuous hyperbolic paraboloidal anticlastic surface comprising affixing a specularly reflective elastic web to the sides and ends of a rigid closed frame, said sides and ends comprising spaced elongate rigid supports angularly offset about their mutual axes, and applying a force to said web between said supports by means for contracting said web to bring said web to a condition of minimum surface area between said supports.
Claim 2
Dependent Claim
72 words
Method of developing a rigid continuous hyperbolic paraboloidal anticlastic surface comprising affixing a specularly reflective elastic web to the sides and ends of a rigid closed frame, said sides and ends comprising spaced elongate rigid supports angularly offset about their mutual axes, and applying a force to said web between said supports by means for contracting said web to bring said web to a condition of minimum surface area between said supports.
Claim 3
Dependent Claim
17 words
Method of claim 1 wherein said means applying said force to said web is by heat shrinking.
Claim 4
Dependent Claim
67 words
Method of developing a rigid continuous hyperbolic paraboloidal anticlastic surface comprising producing a specularly reflective surface on one face of a semi-rigid rectangular flat elastic web of sufficient thickness and rigidity to prevent lateral contraction, supporting said web at opposite ends, and angularly displacing said ends to impart a specific twist deformation to said web wherein the specific twist deformation is not greater than twice said thickness.
Claim 5
Dependent Claim
67 words
Method of developing a rigid continuous hyperbolic paraboloidal anticlastic surface comprising producing a specularly reflective surface on one face of a semi-rigid rectangular flat elastic web of sufficient thickness and rigidity to prevent lateral contraction, supporting said web at opposite ends, and angularly displacing said ends to impart a specific twist deformation to said web wherein the specific twist deformation is not greater than twice said thickness.
Claim 6
Dependent Claim
20 words
Method of claim 3 wherein said twist deformation is obtained by opposite rotation of said ends about their common axis.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |