Patent US4581085A successfully refreshed from Google Patents.
US4581085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lining of pipelines or passageways
Assignee: Insituform Netherlands BV
•
Filing: 1983-01-31
•
Granted: 1986-04-08
•
Expires: 2003-01-31
Abstract
Abstract The invention provides that a tubular lining, suitable comprising an inner felt layer soaked in curable synthetic resin, and an outer impermeable layer, so everted into a pipeline or passageway by means of a gaseous fluid medium which holds the lining against the passageway surface, a pull tape or card which is inside the lining and emerges from the everting face so that tension can be applied thereto, and a lubricating medium inside the everted portion to enable the inwardly travelling uneverted portion to slide over the previously everted portion.
Inventors
- 👤 Eric Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:06
CPC Classifications
B; B29; B29C; B29C63/00; B29C63/26; B29C63/34; B29C63/36; F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1651; F16L58/00; F16L58/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
In the method of lining a passageway by everting a flexible lining tube that includes a resin absorbent material soaked with a curable synthetic resin into the passageway with the aid of pressure medium, the improvement which comprises (a) using a gaseous material as the pressure medium, (b) supporting the inwardly travelling uneverted portion of the tube on the lower surface of the previously everted portion of the tube as the uneverted portion of the tube moves through the previously everted portion of the tube, and (c) facilitating the movement of the uneverted portion of the tube over the lower surface of the previously everted portion of the tube by providing a thin layer of a lubricant between the surfaces of the everted portions and the surfaces of the uneverted portions that are in moving surface contact with each other.
Claim 2
Dependent Claim
140 words
In the method of lining a passageway by everting a flexible lining tube that includes a resin absorbent material soaked with a curable synthetic resin into the passageway with the aid of pressure medium, the improvement which comprises (a) using a gaseous material as the pressure medium, (b) supporting the inwardly travelling uneverted portion of the tube on the lower surface of the previously everted portion of the tube as the uneverted portion of the tube moves through the previously everted portion of the tube, and (c) facilitating the movement of the uneverted portion of the tube over the lower surface of the previously everted portion of the tube by providing a thin layer of a lubricant between the surfaces of the everted portions and the surfaces of the uneverted portions that are in moving surface contact with each other.
Claim 3
Dependent Claim
29 words
The method according to claim 1 wherein the eversion of the tube in the passageway is assisted by a pulling force applied to the uneverted portion of the tube.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein said gaseous medium is air.
Claim 5
Dependent Claim
12 words
A method according to claim 2 wherein said gaseous medium is air.
Claim 6
Dependent Claim
28 words
A method according to claim 1 wherein upon completion of the eversion, the everted lining is filled with hot air in order to effect curing of the resin.
Claim 7
Dependent Claim
28 words
A method according to claim 2 wherein upon completion of the eversion, the everted lining is filled with hot air in order to effect curing of the resin.
Claim 8
Dependent Claim
12 words
A method according to claim 5 wherein said gaseous medium is air.
References Cited (Backward Citations)
US2794758A
Cited
US3132062A
Cited
US4064211A
Cited
US4135958A
Cited
SU490681A1
Cited
GB1569675A
Cited
US4350548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |