US4958959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of relining sewers and water lines without excavation
Assignee: ISCO INDUSTRIES LLC
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Filing: 1989-01-09
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Granted: 1990-09-25
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Expires: 2009-01-09
Abstract
Abstract A method is disclosed for relining buried pipeline with interconnectable plastic type pipe sections. The method comprises gaining access to an open end of the buried pipeline, such as through a manhole, passing pipe sections down the manhole and inserting individually each pipe section into the buried pipeline open end. Each pipe section is of a length to permit, within the confines of the manhole, insertion of each pipe section into the pipeline open end. Each pipe is of a diameter to fit within the pipeline. The pipe section to be inserted is interconnected to the pipe section already inserted within the buried pipeline. Such interconnected sections are sequentially moved into the buried pipeline to permit insertion of the next pipe section into buried pipeline until the entire length of the pipeline to the next access area has been relined.
Inventors
- 👤 Henri S. St. Onge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:38
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/028; F16L1/036; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1657; F16L9/00; F16L9/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A method of relining a buried pipeline with interconnectable plastic pipe sections of an appropriate diameter for insertion within the buried pipeline, each section having a male connection at one end and a female connection at the other end with said female connection and male connection being sized to cooperate with an opposite connection and form a locked fit between said connections such that said connections cannot be inadvertently axially withdrawn one from the other, said method comprising bringing short pipe sections to an open end of the buried pipeline, aligning an individual pipe section with the buried pipeline such that the pipe section is on grade with the buried pipeline, effecting a connection between any pipe section previously immediately inserted in said pipeline to form the locked fit between the sections, forcing said connected pipe sections into the buried pipeline by either pulling or pushing said sections in preparation for the insertion of the next pipe section into the buried pipeline.
Claim 2
Independent Claim
162 words
A method of relining a buried pipeline with interconnectable plastic pipe sections of an appropriate diameter for insertion within the buried pipeline, each section having a male connection at one end and a female connection at the other end with said female connection and male connection being sized to cooperate with an opposite connection and form a locked fit between said connections such that said connections cannot be inadvertently axially withdrawn one from the other, said method comprising bringing short pipe sections to an open end of the buried pipeline, aligning an individual pipe section with the buried pipeline such that the pipe section is on grade with the buried pipeline, effecting a connection between any pipe section previously immediately inserted in said pipeline to form the locked fit between the sections, forcing said connected pipe sections into the buried pipeline by either pulling or pushing said sections in preparation for the insertion of the next pipe section into the buried pipeline.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 1, wherein said step of effecting a locking fit between said pipe sections is accomplished by forcing one pipe section into the other until the locked fit is achieved.
Claim 4
Dependent Claim
38 words
A method as claimed in claim 1, wherein said step of effecting a locking fit between said pipe sections is accomplished by axially rotating one pipe section relative to the other thereby screwing one section into the other.
Claim 5
Dependent Claim
46 words
A method as claimed in claim 1, wherein said pipe sections are brought to the open end of a buried pipeline through a manhole associated with the open end of the buried pipeline and said pipe sections are aligned with the buried pipeline within the manhole.
Claim 6
Dependent Claim
43 words
A method as claimed in claim 1, including continuing to insert and lockingly fit pipe sections and move the sections along the buried pipeline until the leading interconnected pipe section emerges from a remote opening of the buried pipeline at another access area.
Claim 7
Dependent Claim
52 words
A method as claimed in claim 1, wherein said step of bringing short pipe sections to an open end of a buried pipeline is accomplished by passing said sections individually through an existing manhole associated with said buried pipeline in preparation for aligning individual sections with the buried pipeline within the manhole.
References Cited (Backward Citations)
US2926701A
Cited
US3508771A
Cited
DE2242833A1
Cited
JPS5224321A
Cited
JPS54116733A
Cited
US4796669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |