US3605413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Riser with a rigidity varying lower portion
Assignee: Boeing North American Inc
•
Filing: 1969-10-24
•
Granted: 1971-09-20
•
Expires: 1989-10-24
Abstract
Abstract A RISER, ARRANGED FOR COMMUNICATION BETWEEN A STRUCTURE AT THE OCEAN FLOOR AND EQUIPMENT ON THE SURFACE WHERE THE WATER DEPTH MAY BE, FOR EXAMPLE, MORE THAN 600 FEET, HAS A LOWER PORTION WITH A RIGIDITY OR STIFFNESS SUFFICIENT TO WITHSTAND THE WORST CONDITION BENDING MOMENT APPLIED THERETO. THE STIFFNESS OF THE UPPER PORTION IS DETERMINED BY THE DESIGN REQUIREMENTS FOR EFFICIENT AND ECONOMICAL PIPING AND COMMUNICATION BETWEEN THE OCEAN FLOOR AND THE OCEAN SURFACE. IN ADDITION, THE SECOND MODULUS OF THE LOWER PORTION DECREASES AT STATIONS DISPOSED FURTHER FROM THE OCEAN BOTTOM AND WHERE THE UPPER AND LOWER PORTIONS JOIN THE SECTION MODULUS ARE SUBSTANTIALLY THE SAME.
Inventors
- 👤 George W Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:56
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/01; E21B17/017
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |