US4678370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewer renovation system
Assignee: Danby of North America Inc
•
Filing: 1985-10-16
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Granted: 1987-07-07
•
Expires: 2005-10-16
Abstract
Abstract A method for lining a sewer pipe incorporate the steps of continuously forming a liner of helically wound strip, the strip having complementary engaging side formations, and feeding the liner into the sewer pipe. The ends of the liner are sealed to the sewer pipe and cementitious grout is pumped under pressure into the space between the liner and the sewer pipe to bond the liner is position.
Inventors
- 👤 Peter Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:27
CPC Classifications
E; E03; E03F; E03F3/00; E03F3/06; F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1655; E03F2003/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A method of lining a sewer pipe including the steps of: continuously forming a liner of helically wound and inter-engaging strip and feeding it into a sewer to be lined; sealing the end portions of the thus formed liner to the sewer pipe; setting removable plugs into the ends of the liner; pressurizing the liner by introducing fluid thereinto under pressure, said plugs retaining such fluid in said liner; pumping a cementitious grout under pressure into the space between the liner and the pipe, the grout being introduced initially by inlet pipes to a lower part of the space while permitting displaced air to be removed from the upper part of the space, and being subsequently introduced by further inlet pipes to the upper part of the space to totally fill the space; and removing the plugs from the ends of the liner after the grout has set.
Claim 2
Independent Claim
148 words
A method of lining a sewer pipe including the steps of: continuously forming a liner of helically wound and inter-engaging strip and feeding it into a sewer to be lined; sealing the end portions of the thus formed liner to the sewer pipe; setting removable plugs into the ends of the liner; pressurizing the liner by introducing fluid thereinto under pressure, said plugs retaining such fluid in said liner; pumping a cementitious grout under pressure into the space between the liner and the pipe, the grout being introduced initially by inlet pipes to a lower part of the space while permitting displaced air to be removed from the upper part of the space, and being subsequently introduced by further inlet pipes to the upper part of the space to totally fill the space; and removing the plugs from the ends of the liner after the grout has set.
Claim 3
Dependent Claim
37 words
The method as claimed in claim 1, wherein air is vented from the space by the further inlet pipes as the grout is introduced into the lower part of the space by the first mentioned inlet pipes.
Claim 4
Dependent Claim
70 words
The method as claimed in claim 1, wherein the strip is of a plastics material with longitudinal ribs located externally of the wound liner, said strip being formed with side edge portions constructed such that the edge portions of adjacent convolutions of the helically wound strip interlock, and sealing adjacently disposed side edge portions by introducing bonding material to the helical interlocking side portions during the winding of the liner.
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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) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |