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US4770562A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of salvaging a pipe conduit buried under ground

Assignee: Inliner Technologies LLC
•
Filing: 1986-10-17
•
Granted: 1988-09-13
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Expires: 2006-10-17
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Abstract

Abstract A method of salvaging a pipe conduit which has a predetermined inner diameter and is buried under ground, especially a sewer pipe includes the steps of soaking a resin-absorbing inner layer of a lining hose which further includes an impermeable outer layer that outwardly adjoins and surrounds the inner layer and has an outer diameter which is slightly smaller than the inner diameter of the pipe conduit to be salvaged with an amount of a resin that exceeds that needed for saturating the inner layer. The outer layer is perforated to form a plurality of flow-through openings for the resin therein. The lining hose is subsequently introduced in its collapsed state into the pipe conduit. Finally, the lining hose is shaped to conformingly line the pipe conduit by causing a fluid to flow at a superatmospheric pressure into an auxiliary hose at least partially received in the lining hose and including a turned-over region with attendant gradual advancement of the turned-over region of the auxiliary hose into the lining hose and escape of the excess amount of the resin through the flow-through openings.

Inventors

  • 👤 Hans Muller
  • 👤 Hermann Suerbaum

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 16:04
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1651; B; B29; B29C; B29C63/00; B29C63/26; B29C63/28; B29C63/34; B29C63/343; B29C63/48; B29C63/481

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 181 words
A method of salvaging a pipe conduit which has a predetermined inner diameter and is buried under ground, especially a sewer pipe, comprising the steps of soaking a resin-absorbing inner layer of a lining hose, which further includes an impermeable outer layer that outwardly adjoins and surrounds the inner layer and has an outer diameter which is slightly smaller than the inner diameter of the pipe conduit to be salvaged, with an amount of a resin that exceeds that needed for saturating the inner layer; perforating the outer layer to form a plurality of flow-through openings for the resin therein; subsequently introducing the lining hose in a collapsed state thereof into the pipe conduit; and shaping the lining hose to conformingly line the pipe conduit, including causing a fluid to flow at a superatmospheric pressure into an auxiliary hose at least partially received in the lining hose and including a turned-over region with attendant gradual advancement of the turned-over region of the auxiliary hose into the lining hose and escape of the excess amount of the resin through the flow-through openings.
Claim 2
Independent Claim 181 words
A method of salvaging a pipe conduit which has a predetermined inner diameter and is buried under ground, especially a sewer pipe, comprising the steps of soaking a resin-absorbing inner layer of a lining hose, which further includes an impermeable outer layer that outwardly adjoins and surrounds the inner layer and has an outer diameter which is slightly smaller than the inner diameter of the pipe conduit to be salvaged, with an amount of a resin that exceeds that needed for saturating the inner layer; perforating the outer layer to form a plurality of flow-through openings for the resin therein; subsequently introducing the lining hose in a collapsed state thereof into the pipe conduit; and shaping the lining hose to conformingly line the pipe conduit, including causing a fluid to flow at a superatmospheric pressure into an auxiliary hose at least partially received in the lining hose and including a turned-over region with attendant gradual advancement of the turned-over region of the auxiliary hose into the lining hose and escape of the excess amount of the resin through the flow-through openings.
Claim 3
Dependent Claim 28 words
The method as defined in claim 1, wherein said introducing step includes pulling the auxiliary hose into the pipe conduit by an elongated flexible element and a winch.
Claim 4
Dependent Claim 26 words
The method as defined in claim 1, and further comprising the step of removing air from the interior of the lining hose during said shaping step.
Claim 5
Dependent Claim 23 words
The method as defined in claim 1, wherein said soaking step includes soaking the resin-absorbing layer which includes a glass fiber reinforced material.
Claim 6
Dependent Claim 27 words
The method as defined in claim 1, and further comprising the step of hardening the resin after the escape through the through-flow openings of the outer layer.
Claim 7
Dependent Claim 30 words
The method as defined in claim 5, and further comprising the step of withdrawing the auxiliary hose from the lining hose by pulling means after the hardening of the resin.

References Cited (Backward Citations)

US3494813A Cited
US3422631A Cited
DE2240153A1 Cited
US4009063A Cited
DE2362784A1 Cited
US4350548A Cited
US4456401A Cited
US4668125A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-09-13 1992-03-14 1992-09-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-09-13 1996-03-14 1996-09-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-09-13 2000-03-14 2000-09-13 $7700.00 Window Closed / Lapsed

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