US4009063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lining a pipe
Assignee: Insituform Netherlands BV
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Filing: 1975-01-29
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Granted: 1977-02-22
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Expires: 1995-01-29
Abstract
Abstract A method of lining a passageway with a hard, rigid pipe of thermosetting resin, wherein a tubular fibrous felt is immersed in the resin to form a carrier for the resin. The immersed felt and resin have an inflatable tube therein and this tube is inflated to shape the resin to the passageway surface. The resin is cured to form the hard, rigid lining pipe with the felt embedded therein.
Inventors
- 👤 Eric Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:26
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/245; B29; B29C; B29C53/00; B29C53/36; B29C63/00; B29C63/0017; B29C63/0021; B29C63/02; B29C63/04; B29C63/26; B29C63/28; B29C63/34; B29D; B29D23/00; B29D23/001; B32B1/00; B32B1/08; B32B27/00; B32B27/12; B32B27/32; B32B27/36; B32B3/00; B32B3/02; B32B3/04; B32B5/18; E; E03; E03F; E03F3/00; E03F3/04; E03F3/06; E21; E21D; E21D11/00; E21D11/38; E21D11/383; E21D5/00; F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1651; F16L55/1652; F16L55/1654; F16L55/1656; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1009; F16L58/1027; F16L59/00; F16L59/02; F16L9/00; F16L9/14; F16L9/147; B29K; B29K2023/00; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; B29K2223/00; B29L; B29L2009/00; B29L2023/00; B29L2023/005; B29L2023/006; B32B2260/00; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2305/00; B32B2305/02; B32B2305/022; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/04; B32B2367/00; B32B2375/00; B32B2597/00; E03F2003/065; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
99 words
A method of lining a surface at least partially defining a passageway wherein a laminate of non woven felt sandwiched between an outer membrane and an inner membrane of plastics sheet material is urged by fluid pressure so that said outer membrane lies against said surface, said method including the additional steps of totally impregnating the felt with an uncured thermosetting resin so as to completely immerse the felt in the resin, and curing the resin while the laminate is held against such surface so as to form a hard, cured and selfsupporting resin lining having embedded felt reinforcement.
Claim 2
Independent Claim
99 words
A method of lining a surface at least partially defining a passageway wherein a laminate of non woven felt sandwiched between an outer membrane and an inner membrane of plastics sheet material is urged by fluid pressure so that said outer membrane lies against said surface, said method including the additional steps of totally impregnating the felt with an uncured thermosetting resin so as to completely immerse the felt in the resin, and curing the resin while the laminate is held against such surface so as to form a hard, cured and selfsupporting resin lining having embedded felt reinforcement.
Claim 3
Dependent Claim
24 words
The method in accordance with claim 1, wherein the felt is impregnated with the resin before it is laminated between said plastics material membranes.
Claim 4
Dependent Claim
22 words
The method according to claim 1 wherein the felt is impregnated with resin after it is laminated between said plastics material membranes.
Claim 5
Dependent Claim
55 words
The method according to claim 1, wherein the laminate is in tubular form and comprises an inner tube of said plastics material around which is disposed the non woven felt and an outer tube of plastics materials surrounding the felt, the method comprising inflating the tubular laminate against and into the shape of said surface.
Claim 6
Dependent Claim
40 words
The method according to claim 4, wherein said surface comprises the inner surface of an underground sewer, and the tubular laminate is fed down a manhole to the sewer and is inflated against the inner sewer surface when in position.
Claim 7
Dependent Claim
31 words
The method according to claim 4, further including injecting the resin into the felt through slits in the outer tube of plastics material at spaced intervals along the tubular laminate length.
Claim 8
Dependent Claim
24 words
The method according to claim 6, wherein the tubular laminate is passed between nip rollers to distribute evenly the uncured resin throughout the felt.
Claim 9
Dependent Claim
23 words
The method according to claim 5, wherein the ends of the tubular laminate are closed while it is inflated when in the sewer.
Claim 10
Dependent Claim
13 words
The method according to claim 8, wherein the ends are closed by sealing.
Claim 11
Dependent Claim
96 words
The method according to claim 8, wherein one end is closed by a valve member whilst the other end is closed by a weight while the tube is inflated, the valve member being designed to open and allow the flow of sewage through the inflated tube when the head of sewage being held back by the valve member exceeds the air pressure in the tubular laminate, and the weight being of such magnitude that it lifts to allow flow of sewage out of that end of the laminate while maintaining that end closed to air flow.
Claim 12
Dependent Claim
41 words
The method according to claim 8, wherein the ends of the tubular laminate are closed by the ends of a pilot pipe passing through the tubular laminate and through which a flow of sewage is maintained while the laminate is inflated.
Claim 13
Dependent Claim
29 words
The method according to claim 8, wherein the tubular laminate is punctured to allow escape of air when it has been inflated to a condition engaging the sewer surface.
Claim 14
Dependent Claim
20 words
The method according to claim 8, wherein the ends of the laminate are cut off after the resin has cured.
Claim 15
Dependent Claim
22 words
The method according to claim 4, wherein the method includes wrapping the felt round the inner tube and overlapping and joining together.
Claim 16
Dependent Claim
16 words
The method according to claim 1, wherein the fibres of said non-woven felt are polyester fibres.
Claim 17
Dependent Claim
13 words
A method according to claim 1, wherein the resin is a polyester resin.
Claim 18
Dependent Claim
13 words
A method according to claim 1, wherein the plastics sheet material is polyethelene.
Claim 19
Dependent Claim
16 words
A method according to claim 1, wherein the resin is cured by a natural curing process.
Claim 20
Dependent Claim
16 words
A method according to claim 1, wherein the resin is cured by a forced curing process.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |