Patent US4709946A successfully refreshed from Google Patents.
US4709946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lined pipe joint
Assignee: Individual
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Filing: 1987-02-20
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Granted: 1987-12-01
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Expires: 2007-02-20
Abstract
Abstract Disclosed is a method and apparatus for forming a pipe joint for securing lined pipe sections together. A portion of the liners of adjacent pipe sections are overlapped and compressed when the pipe joint is made up so as to seal against the migration of pressurized fluids from within the pipe sections.
Inventors
- 👤 John J. Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:15
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/18; F16L58/182
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A pipe joint comprising: (a) first pipe means having an external annular channel adjacent the end thereof and a continuous fluid impervious liner on the internal surface thereof extending around the end face of said first pipe means and into said external annular channel; (b) second pipe means having a continuous fluid impervious liner on the internal surface thereof and extending from the end of said second pipe means; and (c) sleeve means securing the ends of said first and second pipe means together, said sleeve means having an internal channel positioned in register with said external channel in said first pipe means and securing the end of the liner extending from said second pipe means within said internal channel and overlapping the liner in said external annular channel, whereby the end of said first pipe means and said sleeve means coact to radially compress the overlapped portions of said liners.
Claim 2
Dependent Claim
151 words
A pipe joint comprising: (a) first pipe means having an external annular channel adjacent the end thereof and a continuous fluid impervious liner on the internal surface thereof extending around the end face of said first pipe means and into said external annular channel; (b) second pipe means having a continuous fluid impervious liner on the internal surface thereof and extending from the end of said second pipe means; and (c) sleeve means securing the ends of said first and second pipe means together, said sleeve means having an internal channel positioned in register with said external channel in said first pipe means and securing the end of the liner extending from said second pipe means within said internal channel and overlapping the liner in said external annular channel, whereby the end of said first pipe means and said sleeve means coact to radially compress the overlapped portions of said liners.
Claim 3
Dependent Claim
30 words
A pipe joint as defined in claim 1 wherein the external surfaces of said first and second pipe means are externally threaded and mate with internal threads on said sleeve.
Claim 4
Dependent Claim
42 words
A pipe joint as set forth in claim 2 including a ring of resilient material surrounding the liner extending from the end of said second pipe means in the axial space between the end of said second pipe means and said channels.
References Cited (Backward Citations)
GB190424355A
Cited
US3338598A
Cited
US3307860A
Cited
US3811710A
Cited
US3758361A
Cited
US3943273A
Cited
US4484770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |