US3664689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectively lockable casing hanger
Assignee: Vetco Inc
•
Filing: 1969-08-14
•
Granted: 1972-05-23
•
Expires: 1989-08-14
Abstract
Abstract CASING HANGER APPARATUS FOR HANGING A WELL CASING STRING FROM UNDERWATER WELL HEAD APPARATUS, IN WHICH A LOCK RING ENGAGEABLE WITH A SHOULDER ON THE CASING HANGER, TO LOCK THE CASING HANGER IN PLACE, CAN BE HELD FROM ENGAGING THE SHOULDER BY A FILLER RING WHICH IS REMOVABLY DISPOSED ON THE CASING HANGER BODY. THE FILLER RING IS REMOVED IF THE LOCK RING IS TO BE PERMITTED TO FUNCTION. THUS, THE PRESENCE OR ABSENCE OF THE FILLER MEANS RENDERS THE LOCK RING SELECTIVELY INOPERABLE OR OPERABLE, PERMITTING EASY REMOVAL OF THE CASING HANGER OR ITS LOCKING IN PLACE.
Inventors
- 👤 James W E Hanes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:36
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |