US4497866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sucker rod
Assignee: Albany International Corp
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Filing: 1983-08-23
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Granted: 1985-02-05
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Expires: 2003-08-23
Abstract
Abstract A rod assembly comprising a core component and a sheath component and having an elongate cross-section, the sheath component consisting of an anisotropic assembly of non-metallic filamentary elements embedded in a polymeric matrix whereby the bending stiffness for deformations about an axis parallel to the major axis of the rod assembly is less than the bending stiffness of the same core and sheath components in a radially symmetrical configuration, and in which the core and sheath components have load-elongation characteristics so that the ratio of the strain to the strain-to-break in the sheath is essentially equal to the ratio of the strain to the strain-to-break in the core throughout the working load range.
Inventors
- 👤 De Witt R. Petterson
- 👤 John Skelton
- 👤 David S. Brookstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
E; E21; E21B; E21B17/00; F; F04; F04B; F04B53/00; F04B53/14; F04B53/144; B; B29; B29L; B29L2031/00; B29L2031/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T428/2918; Y10T428/2933; Y10T428/2936; Y10T428/294; Y10T428/2964; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/20456
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A rod assembly comprising in combination a core component and a sheath component and having an elongate cross section, said sheath component consisting of an anisotropic interlaced assembly of non-metallic filamentary elements embedded in a polymeric matrix whereby the bending stiffness for deformations about an axis parallel to the major axis of the elongate cross section is less than the bending stiffness of the same core and sheath components in a radially symmetrical configuration, and in which said core and sheath components have load-elongation characteristics so that the ratio of the strain to the strain to break in the sheath is essentially equal to the ratio of the strain to the strain to break in the core throughout the working load range.
Claim 2
Dependent Claim
122 words
A rod assembly comprising in combination a core component and a sheath component and having an elongate cross section, said sheath component consisting of an anisotropic interlaced assembly of non-metallic filamentary elements embedded in a polymeric matrix whereby the bending stiffness for deformations about an axis parallel to the major axis of the elongate cross section is less than the bending stiffness of the same core and sheath components in a radially symmetrical configuration, and in which said core and sheath components have load-elongation characteristics so that the ratio of the strain to the strain to break in the sheath is essentially equal to the ratio of the strain to the strain to break in the core throughout the working load range.
Claim 3
Dependent Claim
18 words
A rod assembly in accordance with claim 1 in which said non-metallic filamentary elements form a braided structure.
Claim 4
Dependent Claim
21 words
A rod assembly in accordance with claim 1 or 2 in which said non-metallic filamentary elements form a triaxially braided structure.
Claim 5
Dependent Claim
34 words
A rod assembly in accordance with claim 1, 2 or 3 in which said filamentary elements are fiberglass and said core component is a stranded cable of low tensile modulus and high tensile strength.
Claim 6
Dependent Claim
29 words
A rod assembly in accordance with claim 4 in which said core component comprises a transversally compliant center core whereby the extension-to-break characteristic of the core component is increased.
Claim 7
Dependent Claim
20 words
An assembly as defined in claim 1 wherein said sheath component has an external layer comprising a protective filamentary element.
Claim 8
Dependent Claim
48 words
A rod assembly in accordance with claim 1 in which said sheath component consists of a first set of yarns thereof extending in the direction of said core component and a second set of yarns thereof enveloping said core component at angles to said first set of yarns.
References Cited (Backward Citations)
US2262861A
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US3457962A
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US3446251A
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US3936336A
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US4063838A
Cited
US4205926A
Cited
US4360288A
Cited
US4360288B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |