Patent US4862924A successfully refreshed from Google Patents.
US4862924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible hard pipe
Assignee: Individual
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Filing: 1989-03-08
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Granted: 1989-09-05
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Expires: 2009-03-08
Abstract
Abstract A flexible hard pipe in which over a soft inner pipe wall a hard belt-like member is helically wound. The belt-like member has a double-hook shape in which a flat inner surface is fused to the inner pipe wall. A raised hook portion overlaps a hook portion of the fused portion of a neighboring wrap.
Inventors
- 👤 Shiro Kanao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:18
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/11; F16L11/14; F16L11/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
193 words
A flexible hard pipe, comprising an inner pipe wall made of a soft synthetic resin material and an outer pipe wall comprising a helically wrapped belt of interlinked turns of a hard material formed substantially of synthetic resin helically wound on the outer periphery of said inner pipe wall and integrally fused with said inner pipe wall, said helically wrapped hard belt having in cross section a substantially linear base portion, a first radially outwardly extending portion continued from a first edge of said base portion, and a radially inwardly opened substantially U-shaped portion, said inwardly opened substantially U-shaped portion including a second radially outwardly extending portion continued from a second edge portion of said base portion, a ceiling portion connected at a first end to a radially outward part of said second radially outwardly extending portion and extending parallel to said base portion, and a radially inwardly extending portion connected to a second end of said ceiling portion, said belt having a radially inner surface of said base portion solely in contact with and fused to the outer periphery of said inner pipe over the full inner surface of said base portion.
Claim 2
Dependent Claim
193 words
A flexible hard pipe, comprising an inner pipe wall made of a soft synthetic resin material and an outer pipe wall comprising a helically wrapped belt of interlinked turns of a hard material formed substantially of synthetic resin helically wound on the outer periphery of said inner pipe wall and integrally fused with said inner pipe wall, said helically wrapped hard belt having in cross section a substantially linear base portion, a first radially outwardly extending portion continued from a first edge of said base portion, and a radially inwardly opened substantially U-shaped portion, said inwardly opened substantially U-shaped portion including a second radially outwardly extending portion continued from a second edge portion of said base portion, a ceiling portion connected at a first end to a radially outward part of said second radially outwardly extending portion and extending parallel to said base portion, and a radially inwardly extending portion connected to a second end of said ceiling portion, said belt having a radially inner surface of said base portion solely in contact with and fused to the outer periphery of said inner pipe over the full inner surface of said base portion.
Claim 3
Dependent Claim
66 words
A flexible hard pipe having flexibility according to claim 1, further comprising a coating pipe wall made of a soft synthetic resin material formed on the outer peripheral surface of said outer pipe wall and wherein the radial inner peripheral surface of the coating pipe wall is in contact with and solely fused to the radially outer peripheral surface of said ceiling portion of said belt.
Claim 4
Dependent Claim
54 words
A flexible hard pipe having flexibility according to claim 1, in which a width (W 1 ) between said second radially outwardly extending portion and said radially inwardly extending portion is approximately equal to the width (W 2 ) between said first radially outwardly extending portion and said said second radially outwardly extending portion.
Claim 5
Dependent Claim
52 words
A flexible hard pipe having flexibility according to claim 1, in which the width (W 1 ) between said second radially outwardly extending portion and said radially inwardly extending portion is less than the width (W 2 ) between said first radially outwardly extending portion and said second radially outwardly extending portion.
Claim 6
Dependent Claim
77 words
A flexible hard pipe according to claim 1, in which the height (h 1 ) between the radially inner surface of the base portion and the radially outer surface of said ceiling portion, the length (h 2 ) of said radially inwardly extending portion and the height (h 3 ) of said first radially outwardly extending portion are such that h 1 is greater than h 2 and h 2 is approximately equal to h 3 .
Claim 7
Dependent Claim
74 words
A flexible hard pipe according to claim 1, in which the height (h 1 ) between the radially inner surface of said base portion and the radially outer surface of said ceiling portion, the length (h 2 ) of said radially inwardly extending portion and the thickness (t 2 ) of said base portion are such that h 1 is equal to or greater than the sum of h 2 and t 2 .
Claim 8
Dependent Claim
75 words
A flexible hard pipe according to claim 1, in which the height (h 1 ) between the radially inner surface of said base portion and the radially outer surface of said ceiling portion, the height (h 3 ) of said first radially outwardly extending portion, and the thickness (t 1 ) of said ceiling portion are such that h 1 is equal to or greater than the sum of h 3 and t 1 .
Claim 9
Dependent Claim
27 words
A flexible hard pipe according to claim 1, in which said hard belt comprises one synthetic resin material of the group consisting of polyolefins and vinyl chlorides.
Claim 10
Dependent Claim
21 words
A hard pipe according to claim 1, in which said hard belt comprises a metal band coated with synthetic resin material.
Claim 11
Dependent Claim
20 words
A hard pipe according to claim 9, in which said metal band has a plurality of small holes passing therethrough.
Claim 12
Dependent Claim
41 words
A flexible hard pipe according to claim 1, wherein said first and second radially outwardlY extending portion and said radially inwardly extending portion extend in parallel to each other at an angle inclined to a radius of said outer pipe wall.
Claim 13
Dependent Claim
35 words
A flexible hard pipe according to claim 1, wherein each of said radially inwardly extending portion and said first radially outwardly extending portion has at a free end, a portion extending longitudinally towards each other.
Claim 14
Dependent Claim
35 words
A flexible hard pipe according to claim 1, wherein each of said first radially outwardly extending portion and said radially inwardly extending portion has a portion of triangular cross-section tapering towards the free end thereof.
Claim 15
Dependent Claim
38 words
A flexible hard pipe according to claim 1, wherein each of said first radially outwardly extending portion and said radially inwardly extending portion has a portion of trapezoidal cross-section with a larger width at a free end thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |