US3224401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized floating drilling platform
Assignee: Shell USA Inc
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Filing: 1964-04-13
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Granted: 1965-12-21
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Expires: 1984-04-13
Abstract
No abstract record available.
Inventors
- 👤 Lawrence C Kobus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:21
CPC Classifications
B; B63; B63B; B63B39/00; B63B39/06; B63B1/00; B63B1/02; B63B1/10; B63B1/107; B63B35/00; B63B35/44; B63B35/4413; B63B39/02; B63B1/12; B63B2001/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A SEMI-SUBMERSIBLE FLOATING PLATFORM FOR CARRYING OUT OPERATIONS AT OFFSHORE LOCATIONS SUCH AS DRILLING A WELL, SAID PLATFORM COMPRISING A BUOYANT HULL, AN OPERATING PLATFORM CARRIED BY SAID BUOYANT HULL AT A LEVEL ABOVE ANY WAVE ACTION AT THE TIME THE PLATFORM IS POSITIONED AT ITS OPERATING LOCATION AND DEPTH, AND KEEL MEANS FIXEDLY SECURED TO THE OUTER SURFACE OF THE BUOYANT HULL OF SAID VESSEL AT A POINT BELOW THE NORMAL OPERATING WATER LINE THEREOF, SAID KEEL MEANS BEING RIGID AND EXTENDING SUBSTANTIALLY LATERALLY FROM SAID HULL, SAID KEEL MEANS COMPRISING PLATE MEANS HAVING PERFORATIONS THERETHROUGH, SAID PERFORATIONS HAVING AN AREA EQUAL TO FROM ABOUT 2% TO ABOUT 15% OF THE AREA OF THE KEEL MEANS.
Claim 2
Dependent Claim
117 words
A SEMI-SUBMERSIBLE FLOATING PLATFORM FOR CARRYING OUT OPERATIONS AT OFFSHORE LOCATIONS SUCH AS DRILLING A WELL, SAID PLATFORM COMPRISING A BUOYANT HULL, AN OPERATING PLATFORM CARRIED BY SAID BUOYANT HULL AT A LEVEL ABOVE ANY WAVE ACTION AT THE TIME THE PLATFORM IS POSITIONED AT ITS OPERATING LOCATION AND DEPTH, AND KEEL MEANS FIXEDLY SECURED TO THE OUTER SURFACE OF THE BUOYANT HULL OF SAID VESSEL AT A POINT BELOW THE NORMAL OPERATING WATER LINE THEREOF, SAID KEEL MEANS BEING RIGID AND EXTENDING SUBSTANTIALLY LATERALLY FROM SAID HULL, SAID KEEL MEANS COMPRISING PLATE MEANS HAVING PERFORATIONS THERETHROUGH, SAID PERFORATIONS HAVING AN AREA EQUAL TO FROM ABOUT 2% TO ABOUT 15% OF THE AREA OF THE KEEL MEANS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |