Patent US4439469A successfully refreshed from Google Patents.
US4439469A
Expired / Lapsed
US
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Formation of a lining in pipelines
Assignee: INSTITUFORM INTERNATIONAL NV
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Filing: 1982-03-04
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Granted: 1984-03-27
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Expires: 2002-03-04
Abstract
Abstract A method of forming a lining in a pipeline comprising forming on the inner surface of the pipeline a film of initiator and following the formation of this film of initiator, a layer of resin is formed on the film of the initiator for effecting accelerated cure of the resin thereby to form a cured lining in the pipeline inner surface.
Inventors
- 👤 Eric Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:45
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; B; B05; B05D; B05D7/00; B05D7/22; B05D7/222; B05D7/225; B29; B29C; B29C63/00; B29C63/26; B29C63/34; B29C63/36; F16L55/164; F16L55/1645; F16L55/165; F16L55/1651
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A method of forming a lining in a pipeline, which method comprises the steps of (a) forming on the inner surface of the pipeline a film of initiator, (b) depositing on the inner surface of the film of initiator produced in accordance with step (a) a layer of resin whereupon accelerated curing of the resin takes place, (c) repeating steps (a) and (b) any desired number of times until a cured lining of the desired thickness has been built up on the interior of the pipeline.
Claim 2
Independent Claim
86 words
A method of forming a lining in a pipeline, which method comprises the steps of (a) forming on the inner surface of the pipeline a film of initiator, (b) depositing on the inner surface of the film of initiator produced in accordance with step (a) a layer of resin whereupon accelerated curing of the resin takes place, (c) repeating steps (a) and (b) any desired number of times until a cured lining of the desired thickness has been built up on the interior of the pipeline.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein each film of initiator is applied by a centrifugal spraying method.
Claim 4
Dependent Claim
55 words
A method according to claim 1 wherein each film of initiator is applied by means of a carrier tube which is everted into the pipeline, the initiator being on the inside of the carrier tube prior to eversion so that it is presented to the pipeline surface or the surface of the appropriate resin layer.
Claim 5
Dependent Claim
37 words
A method according to claim 1 wherein each film of initiator is applied by filling the pipeline with initiator and then removing excess initiator by displacing it through the pipeline by means of a ball or pig.
Claim 6
Independent Claim
20 words
A method according to any one of claims 1-4, wherein each resin layer is applied by a centrifugal spraying method.
Claim 7
Independent Claim
50 words
A method according to any of claims 1-4 wherein each resin layer is applied by everting the carrier tube into the pipeline, the resin being to the inside of the tube before eversion and to the outside after eversion so that it is presented to the appropriate film of initiator.
Claim 8
Independent Claim
34 words
A method according to any of claims 1-4 wherein each resin layer is applied by filling the pipeline with resin and by removing excess resin by displacing the ball or pig along the pipeline.
References Cited (Backward Citations)
US3312669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |