US3721292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine riser liner apparatus and methods of installing such apparatus
Assignee: Vetco Inc
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Filing: 1971-08-05
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Granted: 1973-03-20
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Expires: 1991-08-05
Abstract
Abstract A LINER INSTALLED IN A DEEP WATER MARINE RISER EXTENDING FROM A REGION NEAR THE FLOOR OF THE OCEAN TO A DRILLING VESSEL OR PLATFORM FLOATING IN OR POSITIONED ABOVE THE OCEAN, THE LOWER PORTION OF THE LINER BEING ANCHORED IN THE LOWER PORTION OF THE MARINE RISER, WITH THE UPPER PORTION OF THE LINER HANGING OR SUPPORTED IN THE UPPER PORTION OF THE MARINE RISER, THE LINER STRING BEWTEEN THE ANCHORING AND HANGING PORTIONS BEING TENSIONED AND MAINTAINED IN TENSION.
Inventors
- 👤 A Ahlstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:05
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043; E21B17/00; E21B17/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |