Patent US3908703A successfully refreshed from Google Patents.
US3908703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Armoured flexible pipe structure
Assignee: IFP Energies nouvelles
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Filing: 1974-02-05
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Granted: 1975-09-30
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Expires: 1994-02-05
Abstract
Abstract This structure comprises an armouring formed by the combination of a succession of rings each having two annular grooves in its internal wall, in the vicinity of the end faces of the ring, and separate annular elements interconnecting adjacent rings of the armouring, the cross section of these elements being shaped as a flattened U and having two arms engaged with some clearance in the two annular grooves, respectively.
Inventors
- 👤 Claude Bournazel
- 👤 Michel Chatard
- 👤 Pierre Grolet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:11
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/08; F16L11/081; F16L11/083; F16L11/14; F16L11/16; F16L11/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
71 words
An armoured flexible pipe structure comprising a plurality of successive rings each ring defining two annular grooves in the internal wall thereof in the vicinity of the end faces of the ring and separate annular elements interconnecting adjacent rings of said pipe structure, said separate annular elements having cross-sections substantially shaped as a flattened U whose two arms are respectively engaged in the annular grooves of adjacent rings with a clearance.
Claim 2
Dependent Claim
71 words
An armoured flexible pipe structure comprising a plurality of successive rings each ring defining two annular grooves in the internal wall thereof in the vicinity of the end faces of the ring and separate annular elements interconnecting adjacent rings of said pipe structure, said separate annular elements having cross-sections substantially shaped as a flattened U whose two arms are respectively engaged in the annular grooves of adjacent rings with a clearance.
Claim 3
Dependent Claim
18 words
A pipe structure according to claim 1, wherein said separate annular elements are resiliently deformable by radial compression.
Claim 4
Dependent Claim
25 words
A pipe structure according to claim 2, wherein said resiliently deformable elements are split so as to facilitate the insertion thereof into said annular grooves.
Claim 5
Dependent Claim
30 words
A pipe structure according to claim 1, including resilient spacing means between adjacent rings of the pipe structure, said spacing means maintaining a substantially uniform distance between said adjacent rings.
Claim 6
Dependent Claim
18 words
A pipe structure according to claim 4, wherein said resilient spacing means comprise rings of a plastic material.
Claim 7
Dependent Claim
21 words
A new armoured flexible pipe structure according to claim 4, wherein said resilient spacing means comprise rings of an elastomeric material.
Claim 8
Dependent Claim
36 words
A pipe structure according to claim 1, wherein each ring comprises means limiting the radial displacement of the ring relative to the pipe axis so as to prevent any disengagement of adjacent rings of the pipe.
Claim 9
Dependent Claim
27 words
A pipe structure according to claim 7, wherein said means comprises a shoulder at one end of each ring extending over a portion of the adjacent ring.
Claim 10
Dependent Claim
22 words
A pipe structure according to claim 8, wherein said shoulder overlaps a resilient spacing means between said ring and an adjacent ring.
Claim 11
Dependent Claim
99 words
A new armoured flexible pipe structure comprising in combination a flexible tubular core covered by armouring layers which comprise a pressure-resisting armouring formed of a succession of rings, each ring defining two annular grooves in the internal wall thereof in the vicinity of the end faces of the ring and separate annular elements interconnecting adjacent rings, the cross-section of said annular elements being shaped as a flattened U with two arms respectively inserted in the annular grooves of adjacent rings with a clearance, and a traction resisting armouring formed of at least one helical winding covering said pressure-resisting armouring.
Claim 12
Dependent Claim
99 words
A new armoured flexible pipe structure comprising in combination a flexible tubular core covered by armouring layers which comprise a pressure-resisting armouring formed of a succession of rings, each ring defining two annular grooves in the internal wall thereof in the vicinity of the end faces of the ring and separate annular elements interconnecting adjacent rings, the cross-section of said annular elements being shaped as a flattened U with two arms respectively inserted in the annular grooves of adjacent rings with a clearance, and a traction resisting armouring formed of at least one helical winding covering said pressure-resisting armouring.
Claim 13
Dependent Claim
20 words
A pipe structure according to claim 10, wherein said traction resisting armouring is covered by at least one tightening sheath.
Claim 14
Dependent Claim
30 words
A pipe structure according to claim 10, wherein said traction-resisting armouring is covered by two nonadhering tightening sheaths, the external sheath exerting a constricting or clamping action on the pipe.
Claim 15
Dependent Claim
35 words
A new flexible pipe according to claim 10, wherein said pressure-resisting armouring is separated from said traction-resisting armouring by a layer of a material which facilitates a relative sliding of said armourings on each other.
Claim 16
Dependent Claim
66 words
An armoured flexible pipe structure comprising a plurality of successive rings, each ring defining two annular grooves in the internal wall thereof, and a plurality of annular elements having U-shaped cross sections, the arms of at least one U-shaped annular element engaging the adjacent grooves of a pair of adjacent rings thereby connecting said acjacent rings together, said arms engaging said annular grooves with a clearance.
Claim 17
Dependent Claim
66 words
An armoured flexible pipe structure comprising a plurality of successive rings, each ring defining two annular grooves in the internal wall thereof, and a plurality of annular elements having U-shaped cross sections, the arms of at least one U-shaped annular element engaging the adjacent grooves of a pair of adjacent rings thereby connecting said acjacent rings together, said arms engaging said annular grooves with a clearance.
Claim 18
Dependent Claim
14 words
The pipe structure according to claim 14, wherein said clearance is an axial clearance.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |