US3847716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doily for reinforcing the wall of a flexible walled liquid container
Assignee: UNIROYAL PLASTICS COMPANY Inc WORLD HEADQUARTERS MIDDLEBURY CT 06749 A CORP OF
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Filing: 1973-02-28
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Granted: 1974-11-12
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Expires: 1993-02-28
Abstract
Abstract Fittings of markedly superior crashworthiness for flexible walled liquid containers, particularly fuel tanks for aircraft such as airplanes and helicopters, are made by reinforcing the container wall around such fittings with a plurality of subsequently concentric annular turns, such as rings or other shapes utilizing parallel peripheral cords, of substantially inextensible reinforcing material, such as metal wire or textile cords, especially glass fiber cord, of the type commonly used for reinforcing rubber articles. For use in so reinforcing the container, wall reinforcing doilies are provided which comprise an annular sheet of curable but uncured polymeric material embodying (as by attachment to one face of said sheet or by embedment in said sheet or between two such sheets) substantially inextensible reinforcing material disposed as concentric annular turns, such as rings or other shapes utilizing parallel peripheral cords, in a plane generally parallel to the plane of the sheet. Preferably the reinforcing material is found spirally about the aperture with the adjacent spiral turns in actual physical contact over at least 80 percent of the spiral length.
Inventors
- 👤 R Dorsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:53
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/08; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/218
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
As an article of manufacture, a reinforcing doily adapted for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising an annular sheet of curable but uncured polymeric material having a central opening and a plurality of closely adjacent substantially concentric annular turns of substantially inextensible reinforcing material disposed in the plane of said sheet.
Claim 2
Dependent Claim
65 words
As an article of manufacture, a reinforcing doily adapted for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising an annular sheet of curable but uncured polymeric material having a central opening and a plurality of closely adjacent substantially concentric annular turns of substantially inextensible reinforcing material disposed in the plane of said sheet.
Claim 3
Dependent Claim
56 words
As an article of manufacture, a reinforcing doily adapted for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising an annular sheet of curable but uncured polymeric material having a central opening and substantially inextensible reinforcing material wound spirally in the plane of said sheet.
Claim 4
Dependent Claim
56 words
As an article of manufacture, a reinforcing doily adapted for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising an annular sheet of curable but uncured polymeric material having a central opening and substantially inextensible reinforcing material wound spirally in the plane of said sheet.
Claim 5
Dependent Claim
26 words
An article of manufacture as set forth in claim 2 wherein said reinforcing material is selected from the group consisting of textile cord and metal cord.
Claim 6
Dependent Claim
31 words
An article of manufacture as set forth in claim 2 wherein there is physical contact between adjacent turns of said reinforcing material over at least 80 percent of the spiral length.
Claim 7
Dependent Claim
18 words
An article of manufacture as set forth in claim 4 wherein said reinforcing material comprises glass fiber cord.
Claim 8
Dependent Claim
103 words
As an article of manufacture, a reinforcing doily for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising an annular sheet of curable but uncured polymeric material, said sheet having a central opening adapted to encircle the fitting, and a plurality of closely adjacent coplanar annular turns of substantially inextensible reinforcing cord surrounding said opening and being adhered to said sheet, said turns being substantially concentric with said opening, beinG disposed in the same plane and in the plane of said sheet, and extending from the inward edge of said opening outwardly.
Claim 9
Dependent Claim
103 words
As an article of manufacture, a reinforcing doily for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising an annular sheet of curable but uncured polymeric material, said sheet having a central opening adapted to encircle the fitting, and a plurality of closely adjacent coplanar annular turns of substantially inextensible reinforcing cord surrounding said opening and being adhered to said sheet, said turns being substantially concentric with said opening, beinG disposed in the same plane and in the plane of said sheet, and extending from the inward edge of said opening outwardly.
Claim 10
Dependent Claim
50 words
An article of manufacture as set forth in claim 6 wherein said cord is glass fiber cord and is wound spirally from the inward edge of said opening outwardly, and wherein there is physical contact between adjacent turns of said cord over at least 80 percent of the spiral length.
Claim 11
Dependent Claim
102 words
As an article of manufacture, a reinforcing doily adapted for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising a laminated composite of two parallel substantially coextensive annular sheets of curable and uncured polymeric material, each of said sheets having a central opening adapted to encircle the fitting, and a reinforcing cord layer disposed between, and bonded to each of, said sheets, said reinforcing cord layer comprising a plurality of closely adjacent coplanar annular turns of substantially inextensible reinforcing cord wound spirally from the inward edge of said opening outwardly thereof.
Claim 12
Dependent Claim
102 words
As an article of manufacture, a reinforcing doily adapted for use in reinforcing the wall of a flexible walled liquid container in the area surrounding a fitting, said doily comprising a laminated composite of two parallel substantially coextensive annular sheets of curable and uncured polymeric material, each of said sheets having a central opening adapted to encircle the fitting, and a reinforcing cord layer disposed between, and bonded to each of, said sheets, said reinforcing cord layer comprising a plurality of closely adjacent coplanar annular turns of substantially inextensible reinforcing cord wound spirally from the inward edge of said opening outwardly thereof.
Claim 13
Dependent Claim
38 words
An article of manufacture as set forth in claim 8 wherein said cord is glass fiber cord and wherein there is physical contact between adjacent turns of said cord over at least 80 percent of the spiral length.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |