US4400019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer pipe joint
Assignee: UNISERT SYSTEMS Inc A CORP OF TX
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Filing: 1981-04-22
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Granted: 1983-08-23
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Expires: 2001-04-22
Abstract
Abstract The invention is directed to a multilayer pipe joint and, more particularly, to a pipe joint for effectively joining sections of pipe having an outer metal casing, an inner plastic pipe, and an annular cement grout sleeve. The joint comprises a dual material ring which is at least partially fitted within a recessed annular space at the end of each multilayer pipe section. The metal casing may be welded to the outer steel component of the ring, and the inner plastic pipe is sealed against the plastic component of the pipe.
Inventors
- 👤 Benant E. Fruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:34
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/02; F16L13/0254; F16L25/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
132 words
A ring-shaped member for sealingly joining lengths of pipe having an outer casing, an inner plastic pipe, and an annulus formed between said outer casing and said plastic pipe, comprising: a metallic outer band for fitting engagement between said casing and said plastic pipe at adjacent end sections of two lengths of said pipe, an inner plastic band connected to and positioned radially inward of said metallic band and having a first surface for encompassing the external diameter surface of said plastic pipe, sealing means adjacent said plastic band and adapted for engagement with said plastic pipe for sealing fluid within said pipe, and said metallic outer band having a design thickness sufficient to withstand the maximum anticipated radial and tangential forces caused by pipeline fluid pressure independent of said outer casing.
Claim 2
Dependent Claim
132 words
A ring-shaped member for sealingly joining lengths of pipe having an outer casing, an inner plastic pipe, and an annulus formed between said outer casing and said plastic pipe, comprising: a metallic outer band for fitting engagement between said casing and said plastic pipe at adjacent end sections of two lengths of said pipe, an inner plastic band connected to and positioned radially inward of said metallic band and having a first surface for encompassing the external diameter surface of said plastic pipe, sealing means adjacent said plastic band and adapted for engagement with said plastic pipe for sealing fluid within said pipe, and said metallic outer band having a design thickness sufficient to withstand the maximum anticipated radial and tangential forces caused by pipeline fluid pressure independent of said outer casing.
Claim 3
Dependent Claim
61 words
Apparatus as defined in claim 1, wherein said inner plastic band comprises: an outer lip having said first surface for engagement with said external diameter surface of said plastic pipe, and an annular plastic portion approximately centrally located on said ring and having two end surfaces for engagement with respective ends of said plastic pipe of adjacent lengths of said pipe.
Claim 4
Dependent Claim
30 words
Apparatus as defined in claim 2, wherein said annular plastic portion has a dovetail cross-sectional configuration for retaining said ends of said plastic pipe in engagement with said outer lip.
Claim 5
Dependent Claim
40 words
Apparatus as defined in claim 2, wherein said inner band further comprises: an inner lip adapted for positioning radially inwardly of said plastic pipe and having a second surface for engagement with the internal diameter surface of said plastic pipe.
Claim 6
Dependent Claim
32 words
Apparatus as defined in claim 4, wherein at least one of said first surface or said second surface is tapered for increased sealing engagement between said plastic band and said plastic pipe.
Claim 7
Dependent Claim
33 words
Apparatus as defined in claim 4, wherein said sealing means comprises at least one annular O-ring carried on at least one of said inner and outer lips for engagement with said plastic pipe.
Claim 8
Dependent Claim
128 words
Apparatus for forming a pipe system, comprising: first and second lengths of pipe each having an outer casing and an inner plastic pipe, said outer casing and said inner plastic pipe defining an annular aperture at an end section at each end of said first and second lengths of said pipe, and a ring-shaped joining member for joining said first and second lengths of pipe, including (a) a metallic outer band positioned within said annular aperture between said casing and said plastic pipe, (b) an inner plastic band connected to and positioned radially inwardly of said metallic band and positioned at least partially within said annular aperture, and (c) sealing means adjacent said plastic band and in engagement with said plastic pipe for sealing fluid within said pipe.
Claim 9
Dependent Claim
128 words
Apparatus for forming a pipe system, comprising: first and second lengths of pipe each having an outer casing and an inner plastic pipe, said outer casing and said inner plastic pipe defining an annular aperture at an end section at each end of said first and second lengths of said pipe, and a ring-shaped joining member for joining said first and second lengths of pipe, including (a) a metallic outer band positioned within said annular aperture between said casing and said plastic pipe, (b) an inner plastic band connected to and positioned radially inwardly of said metallic band and positioned at least partially within said annular aperture, and (c) sealing means adjacent said plastic band and in engagement with said plastic pipe for sealing fluid within said pipe.
Claim 10
Dependent Claim
41 words
Apparatus as defined in claim 7, further comprising: a non-metallic material generally filling said annular aperture between said outer casing and said inner plastic pipe, and each end of the said metallic outer band is in engagement with said non-metallic material.
Claim 11
Dependent Claim
34 words
Apparatus as defined in claim 7, wherein said metallic outer band has a thickness sufficient to withstand the maximum anticipated radial and tangential forces caused by pipeline fluid pressure independent of said outer casing.
Claim 12
Dependent Claim
33 words
Apparatus as defined in claim 7, said metallic outer band is adapted to absorb sufficient heat to shield said inner plastic band from excessive temperatures during a welding operation on said outer casing.
Claim 13
Dependent Claim
24 words
Apparatus as defined in claim 7, wherein an outer diameter of said outer band is slightly less than an inner diameter of said casing.
Claim 14
Dependent Claim
71 words
Apparatus as defined in claim 7, wherein said inner plastic band comprises: an outer lip positioned between said metal outer band and said plastic pipe and having said first surface in engagement with the external diameter surface of said plastic pipe, and an annular plastic portion approximately centrally located on said ring and having two end surfaces in engagement with respective ends of said plastic pipe of adjacent lengths of pipe.
Claim 15
Dependent Claim
28 words
Apparatus as defined in claim 7, further comprising: connecting means secured to said outer casing for interlocking adjacent end sections of said first and second lengths of pipe.
Claim 16
Dependent Claim
33 words
Apparatus as defined in claim 13, wherein said outer casing is metallic, and said connecting means is a weld on said metallic outer casing for joining said adjacent end sections of said pipe.
Claim 17
Dependent Claim
31 words
Apparatus as defined in claim 8, wherein said annular aperture between said outer casing and said inner plastic pipe extends throughout the length of said first and second lengths of pipe.
Claim 18
Dependent Claim
31 words
Apparatus as defined in claim 7, wherein said sealing means comprises an adhesive material in engagement with both said plastic band and said plastic pipe for sealing fluid within said pipe.
Claim 19
Dependent Claim
87 words
Apparatus as defined in claim 12, wherein said inner plastic band further comprises an inner lip positioned radially inwardly of said plastic pipe and having a second surface in engagement with the internal diameter surface of said plastic pipe, and at least one of said plastic pipe internal diameter surface, said plastic pipe external diameter surface, said first surface of said inner plastic band, or said second surface of said inner plastic band is tapered for increasing sealing engagement between said plastic band and said plastic pipe.
Claim 20
Dependent Claim
31 words
Apparatus as defined in claim 2, wherein said sealing means comprises an adhesive material in engagement with both said plastic band and said plastic pipe for sealing fluid within said pipe.
Claim 21
Independent Claim
136 words
A method of forming a pipe system, comprising: forming first and second lengths of pipe each having an outer casing and an inner plastic pipe, forming an annular aperture between said outer casing and said inner plastic pipe at an end section of each of said first and second lengths of pipe for receiving a portion of a ring-like joining member, fitting a metal portion of said ring-like joining member within said annular aperture at adjacent ends of both said first and second lengths of pipe, sealingly engaging a plastic portion of said ring-like joining member with said inner plastic pipe at said adjacent end sections of both said first and second lengths of pipe, and interconnecting said outer casing of said first length of pipe with said outer casing of said second length of pipe.
Claim 22
Independent Claim
136 words
A method of forming a pipe system, comprising: forming first and second lengths of pipe each having an outer casing and an inner plastic pipe, forming an annular aperture between said outer casing and said inner plastic pipe at an end section of each of said first and second lengths of pipe for receiving a portion of a ring-like joining member, fitting a metal portion of said ring-like joining member within said annular aperture at adjacent ends of both said first and second lengths of pipe, sealingly engaging a plastic portion of said ring-like joining member with said inner plastic pipe at said adjacent end sections of both said first and second lengths of pipe, and interconnecting said outer casing of said first length of pipe with said outer casing of said second length of pipe.
Claim 23
Dependent Claim
36 words
The method as defined in claim 7, further comprising: applying an adhesive material to at least one of said plastic portion of said ring-like joining member or said plastic pipe for sealing fluid within said pipe.
Claim 24
Dependent Claim
25 words
A method as defined in claim 19, wherein said first length of pipe and said second length of pipe are interconnected by a welding operation.
Claim 25
Independent Claim
212 words
A method of forming a multilayer pipe system, comprising: forming a first and second length of multilayer pipe each having at least three distinct layers including an outer metal casing, an inner plastic pipe, and a filler material generally filling the annulus between said outer metal casing and said inner plastic pipe, forming an end section at each end of said first and second lengths of said multilayer pipe including said outer metal casing and said inner plastic pipe defining an annular aperture for receiving a portion of a ring-like joining member, fitting a metal portion of said ring-like member within said annular aperture of said first length of said pipe, sealingly engaging a first plastic portion of said ring-like member with said plastic pipe portion on said end section of said first length of said pipe, bringing said second length of pipe axially aligned with both said first length of said pipe and said ring-like member into fitting engagement with said ring-like member, sealingly engaging a second plastic portion of said ring-like member with said plastic pipe portion on an end section of said second length of pipe, and interconnecting said metal casing of said first length of said pipe with said metal casing of said second length of said pipe.
Claim 26
Independent Claim
212 words
A method of forming a multilayer pipe system, comprising: forming a first and second length of multilayer pipe each having at least three distinct layers including an outer metal casing, an inner plastic pipe, and a filler material generally filling the annulus between said outer metal casing and said inner plastic pipe, forming an end section at each end of said first and second lengths of said multilayer pipe including said outer metal casing and said inner plastic pipe defining an annular aperture for receiving a portion of a ring-like joining member, fitting a metal portion of said ring-like member within said annular aperture of said first length of said pipe, sealingly engaging a first plastic portion of said ring-like member with said plastic pipe portion on said end section of said first length of said pipe, bringing said second length of pipe axially aligned with both said first length of said pipe and said ring-like member into fitting engagement with said ring-like member, sealingly engaging a second plastic portion of said ring-like member with said plastic pipe portion on an end section of said second length of pipe, and interconnecting said metal casing of said first length of said pipe with said metal casing of said second length of said pipe.
Claim 27
Dependent Claim
38 words
A method as defined in claim 22, wherein said end section is formed by removing said cementative material between said outer metal casing and said inner plastic pipe for a preselected distance from an end of said pipe.
Claim 28
Dependent Claim
27 words
A method as defined in claim 22, further comprising: applying an epoxy material to said first plastic portion and said second plastic portion of said ring-like member.
Claim 29
Dependent Claim
27 words
A method as defined in claim 22, wherein said first length of said pipe and said second length of said pipe are interconnected by a welding operation.
Claim 30
Dependent Claim
32 words
A method as defined in claim 24, further comprising: applying heat to said metal portion of said ring-like member in an amount sufficient to substantially decrease curing time for said epoxy material.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |