Patent US4913473A successfully refreshed from Google Patents.
Patent US3395755A successfully refreshed from Google Patents.
US3395755A
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Assignee: Mobil Oil AS
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Filing: 1966-03-30
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Granted: 1968-08-06
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Expires: 1986-03-30
Abstract
No abstract record available.
Inventors
- 👤 William F Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:05
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/06; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/037
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AN ACCESS CAISSON FOR PROVIDING ATMOSPHERIC CONDITIONS IN AN AREA SURROUNDING A SUBMERGED WELLHEAD, SAID ACCESS CAISSON COMPRISING AT LEAST ONE CYLINDRICAL CAISSON SECTION HAVING A CYLINDRICAL HOLLOW INTERIOR EXTENDING THE LENGTH THEREOF; MEANS FOR SEALING THE LOWER END OF SAID ACCESS CAISSON TO A LANDING BASE OF A SUBMERGED WELLHEAD; MEANS FOR SELECTIVELY CLOSING OFF THE LOWER PORTION OF SAID CYLINDRICAL HOLLOW INTERIOR ABOVE A WELLHEAD EXTENDING THEREINTO TO DEFINE A WORKING CHAM-
Claim 2
Dependent Claim
74 words
AN ACCESS CAISSON FOR PROVIDING ATMOSPHERIC CONDITIONS IN AN AREA SURROUNDING A SUBMERGED WELLHEAD, SAID ACCESS CAISSON COMPRISING AT LEAST ONE CYLINDRICAL CAISSON SECTION HAVING A CYLINDRICAL HOLLOW INTERIOR EXTENDING THE LENGTH THEREOF; MEANS FOR SEALING THE LOWER END OF SAID ACCESS CAISSON TO A LANDING BASE OF A SUBMERGED WELLHEAD; MEANS FOR SELECTIVELY CLOSING OFF THE LOWER PORTION OF SAID CYLINDRICAL HOLLOW INTERIOR ABOVE A WELLHEAD EXTENDING THEREINTO TO DEFINE A WORKING CHAM-
References Cited (Backward Citations)
US1048194A
Cited
US2051926A
Cited
US2524382A
Cited
US2534480A
Cited
US2691272A
Cited
US2854215A
Cited
US2988144A
Cited
US2965174A
Cited
US3202216A
Cited
US3020956A
Cited
US3202217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |