US3474857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wellhead closure apparatus
Assignee: Shell USA Inc
•
Filing: 1962-08-16
•
Granted: 1969-10-28
•
Expires: 1982-08-16
Abstract
No abstract record available.
Inventors
- 👤 Nicholas B Newman
- 👤 Kenneth W Foster
- 👤 Ronald L Geer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:42
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/037; E21B43/00; E21B43/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN A WELL INSTALLATION LOCATED UNDERWATER AT AN OFFSHORE LOCATION COMPRISING WELL CASING MEANS CEMENTED IN SAID WELL, WELL TUBING MEANS SUSPENDED IN SAID CASING MEANS, A WELLHEAD ASSEMBLY CLOSING SAID CASING MEANS AND TUBING MEANS, APPARATUS FOR CLOSING THE TOP OF SAID WELLHEAD ASSEMBLY AND PERMITTING RE-ENTRY THERETO, SAID APPARATUS COMPRISING A BODY MEMBER FIXEDLY SECURED COAXIALLY TO THE TOP OF SAID WELLHEAD ASSEMBLY IN A FLUIDTIGHT MANNER, VERTICAL CONDUIT MEANS IN SAID BODY MEM-
Claim 2
Dependent Claim
76 words
IN A WELL INSTALLATION LOCATED UNDERWATER AT AN OFFSHORE LOCATION COMPRISING WELL CASING MEANS CEMENTED IN SAID WELL, WELL TUBING MEANS SUSPENDED IN SAID CASING MEANS, A WELLHEAD ASSEMBLY CLOSING SAID CASING MEANS AND TUBING MEANS, APPARATUS FOR CLOSING THE TOP OF SAID WELLHEAD ASSEMBLY AND PERMITTING RE-ENTRY THERETO, SAID APPARATUS COMPRISING A BODY MEMBER FIXEDLY SECURED COAXIALLY TO THE TOP OF SAID WELLHEAD ASSEMBLY IN A FLUIDTIGHT MANNER, VERTICAL CONDUIT MEANS IN SAID BODY MEM-
References Cited (Backward Citations)
US1902540A
Cited
US2139207A
Cited
US2927643A
Cited
US2889886A
Cited
US2906500A
Cited
US3032106A
Cited
US3032105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |