US4637754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lining of pipelines and passageways
Assignee: Insituform Netherlands BV
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Filing: 1984-12-14
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Granted: 1987-01-20
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Expires: 2004-12-14
Abstract
Abstract The invention provides that a resin impregnated lining tube is applied to a pipeline or passageway surface to which have been pre-applied pads impregnated with the same resin, so that the resin impregnated pads bond to the liner as curing of the resin takes place.
Inventors
- 👤 Eric Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:48
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1009; F16L58/1027; B; B29; B29C; B29C63/00; B29C63/26; B29C63/34; B29C63/48; B29C2063/488
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A method of lining a pipeline or passageway comprising the steps of: A. inserting pads of resin absorbent material impregnated with a curable synthetic resin into the pipeline or passageway at spaced intervals by driving an anchoring pin through each pad into a wall of the pipeline or passageway so that a head of said pin traps the respective pad to said wall while leaving an overlapping portion of the pad surrounding the head of the pin; B. inserting into the pipeline or passageway, before the resin impregnating said pads of material has cured, a resin impregnated tubular liner presenting a face of uncured resin to said pads so that the uncured resin face of the liner comes into resin contact with the overlapping portions of the pads of resin absorbent material; and C. curing the resin of the pads of resin absorbent material and the liner such that the pin heads become embedded in cured resin and provide compressive hoop stress reinforcement for the liner.
Claim 2
Independent Claim
166 words
A method of lining a pipeline or passageway comprising the steps of: A. inserting pads of resin absorbent material impregnated with a curable synthetic resin into the pipeline or passageway at spaced intervals by driving an anchoring pin through each pad into a wall of the pipeline or passageway so that a head of said pin traps the respective pad to said wall while leaving an overlapping portion of the pad surrounding the head of the pin; B. inserting into the pipeline or passageway, before the resin impregnating said pads of material has cured, a resin impregnated tubular liner presenting a face of uncured resin to said pads so that the uncured resin face of the liner comes into resin contact with the overlapping portions of the pads of resin absorbent material; and C. curing the resin of the pads of resin absorbent material and the liner such that the pin heads become embedded in cured resin and provide compressive hoop stress reinforcement for the liner.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein Step B includes the step of inserting said tubular liner by an eversion process.
Claim 4
Dependent Claim
44 words
A method according to claim 1, further including the step of inserting a washer between each pad and the respective pin head such that said pin extends through said washer, so as to strengthen the resistance of said liner to radial compressive forces thereon.
Claim 5
Dependent Claim
11 words
A method according to claim 1, wherein said pads are circular.
Claim 6
Dependent Claim
41 words
A method according to claim 1, wherein the pads are pinned using studs which are fired into the pipeline or passageway surface using a suitable firing gun, the pins carrying washers to trap the pads to the pipeline or passageway surface.
Claim 7
Dependent Claim
71 words
A method according to claim 3, wherein the pads are pre-impregnated with resin, and the tube is applied before the resin cures so that the resin of the lining cures with that of the pad and the holding washer ends up as encapsulated in resin which eventually cures to a hard state whereby extra anchorage for the lining is achieved, and the hoop stress which the lining can withstand is increased.
Claim 8
Dependent Claim
71 words
A method according to claim 5, wherein the pads are pre-impregnated with resin, and the tube is applied before the resin cures so that the resin of the lining cures with that of the pad and the holding washer ends up as encapsulated in resin which eventually cures to a hard state whereby extra anchorage for the lining is achieved, and the hoop stress which the lining can withstand is increased.
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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |