US3685546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally insulated pipe
Assignee: Wavin BV
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Filing: 1970-06-03
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Granted: 1972-08-22
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Expires: 1990-06-03
Abstract
Abstract A heat insulated pipeline comprising a number of metal tubes welded together end-to-end. Each tube is surrounded by a layer of heat insulating material, such as polyurethane foam, which in turn is enclosed by a protective layer of an impervious material, such as a thermoplastic covering. Intermediate partitions are disposed for connecting the protective layer and the surface of the metal tubes to permit injection of the foam into the complete space defined between the protective layer and the tube.
Inventors
- 👤 Franck Sigmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:59
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/143; F16L59/04; F16L59/12; F16L59/13; F16L59/16; F16L59/18; F16L59/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
215 words
An insulated pipe line, comprising an axially spaced elongated weldable pipe, a pair of elongated layers of insulating foam plastic material disposed in surrounding relationship to said pipe, an elongated sleeve-like protective layer of plastic material enclosing said insulating layers for preventin penetration of liquids or vapors from outside into the insulating layers, said sleeve-like protective layer including first and second axially spaced portions to encase said pair of axially spaced insulating layers, said axially spaced portions having confronting annular end portions projecting radially inwardly toward the outer surface of said weldable pipe, and sleeve means of diameter substantially less than the outer diameter of said annular end portions and snugly and sealingly surrounding said pipe, said sleeve means extending axially between the confronting annular end portions and fixedly connecting to the parts of said end portions nearest the pipe for creating a tight sealed relationship between the outer surface of said pipe and said annular end portions, said sleeve means including several radially stacked layers in snug and sealed relation, one such layer comprising reduced diameter protective layer portions integral with and extending axially from said protective layer end portions, another such layer comprising elastic seal ring means, said pipe and seal ring means and reduced diameter protective layer portion lying in circumscribed relationship.
Claim 2
Dependent Claim
215 words
An insulated pipe line, comprising an axially spaced elongated weldable pipe, a pair of elongated layers of insulating foam plastic material disposed in surrounding relationship to said pipe, an elongated sleeve-like protective layer of plastic material enclosing said insulating layers for preventin penetration of liquids or vapors from outside into the insulating layers, said sleeve-like protective layer including first and second axially spaced portions to encase said pair of axially spaced insulating layers, said axially spaced portions having confronting annular end portions projecting radially inwardly toward the outer surface of said weldable pipe, and sleeve means of diameter substantially less than the outer diameter of said annular end portions and snugly and sealingly surrounding said pipe, said sleeve means extending axially between the confronting annular end portions and fixedly connecting to the parts of said end portions nearest the pipe for creating a tight sealed relationship between the outer surface of said pipe and said annular end portions, said sleeve means including several radially stacked layers in snug and sealed relation, one such layer comprising reduced diameter protective layer portions integral with and extending axially from said protective layer end portions, another such layer comprising elastic seal ring means, said pipe and seal ring means and reduced diameter protective layer portion lying in circumscribed relationship.
Claim 3
Dependent Claim
103 words
An insulated pipe line according to claim 1, wherein said seal ring means is provided on the outer surface of said pipe in surrounding relationship thereto, and said reduced diameter protective layer portions are disposed in surrounding relationship to and in sealing engagement with said seal ring means, said reduced diameter protective layer portions having a diameter substantially closer to said pipe than the diameter of said first and second axially spaced portions of said protective layer, said reduced diameter protective layer portions also being integrally interconnected whereby to be continuous with said first and second axially spaced portions of said protective layer.
Claim 4
Dependent Claim
52 words
An insulated pipe line according to claim 1, wherein said sleeve means includes a sleeve of fiber reinforced thermosetting resin disposed in sealing engagement and in surrounding relation to said pipe, said sleeve having the opposite ends thereof disposed in sealing engagement with the radially inner ends of said annular end portions.
Claim 5
Dependent Claim
40 words
An insulated pipe line according to claim 3, whereIn said elastic seal ring means comprises a resiliently compressible annular sealing member disposed between the radially inner end of each said end portion and the adjacent end of said thermosetting sleeve.
Claim 6
Dependent Claim
67 words
An insulated pipe line according to claim 3, wherein the axial ends of the thermosetting sleeve and the reduced diameter protective layer portions overlap, and wherein an annular fiber band is disposed between the overlapping ends of the thermosetting sleeve and the reduced diameter protective layer portions, the fibers adhering to the plastic of the reduced diameter protective layer portions and also adhering to the thermosetting sleeve.
Claim 7
Dependent Claim
94 words
An insulated pipe line according to claim 1, wherein the axial space between the confronting annular end portions is filled with further insulating material surrounding said sleeve means, and an annular outer layer is disposed in surrounding relationship to said further insulating material, said annular outer layer extending between said annular end portions and having the opposite axial ends thereof telescoped over the adjacent ends of said first and second axially spaced portions of said protective layer, and means for sealing provided between the ends of said annular outer layer and said protective layer.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |