Patent US3662045A successfully refreshed from Google Patents.
US3662045A
Expired / Lapsed
US
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Method for providing a cement sheathed plastic liner within a flowline
Assignee: UNISERT SYSTEMS Inc
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Filing: 1970-04-24
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Granted: 1972-05-09
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Expires: 1990-04-24
Abstract
Abstract A thermoplastic liner is threaded into an oilfield flowline. An annular space is defined between liner and flowline. The line is cemented in place by: plugging one end of the liner and the two ends of the annular space; filling the liner with water; pumping cement into the annulus while controlling the cement pumping pressure and the liner pressure so that the pressure within the liner is always greater than the pressure in the annulus but less than the liner rupture pressure.
Inventors
- 👤 Kenneth Tierling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:40
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; B; B29; B29C; B29C49/00; B29C49/24; B29C49/26; B29C63/00; B29C63/26; B29C63/34
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |