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US3655472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making high brightness reflection screens
Assignee: Eastman Kodak Co
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Filing: 1969-09-16
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Granted: 1972-04-11
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Expires: 1989-09-16
Abstract
Abstract High brightness reflection screens of the type described in U.S. Pat. No. 3,408,132 can be formed to the required curvature from nonself-supporting aluminum foil without the use of rigid molds by employing air pressure in the manner described to inflate the foil. The aluminum foil is made self-supporting with resin and resin reinforcing materials.
Inventors
- 👤 Jasper S Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; B32B15/00; B32B15/04; B32B15/08; B32B15/092; B32B15/20; B32B27/38; G03B21/60; B32B2311/00; B32B2311/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
43 words
The method of claim 1 wherein the step of temporarily sealing the edges of the flexible material to the edges of the form comprises clamping the edges of the flexible material to the edges of the form to provide a substantially air-tight seal.
Claim 2
Dependent Claim
30 words
The method of claim 1 wherein the resins are selected from the group consisting of epoxy and polyester type resins and the reinforcing materials comprise woven or matte glass fibers.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said rigid shape approximates a segment from the surface of a sphere.
Claim 4
Independent Claim
177 words
A method of forming a self-supporting concave reflectance screen using an air-tight form and a flexible substantially air impervious metal foil stretchable to less than about 2 percent elongation and having two opposed surfaces at least one of which has desired screen reflectance characteristics, said method comprising temporarily sealing the edges of the foil to the edges of the form with said one surface facing the form to provide a substantially air tight cavity between the form and the foil, introducing sufficient fluid between the form and the foil to stretch said foil to less than about 2 percent elongation in its center and into a shape which is concave toward the form and to support the foil in such shape, fixing the shape so supported by applying hardenable liquid resins on the other surface of the foil, hardening the resins in situ to preserve the reflectance characteristics of the foil, applying resin reinforcing material to the hardened resins to render the foil rigid and self-supporting, and removing the self-supporting foil along sealed edges from the form.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |