Patent US3561220A successfully refreshed from Google Patents.
US3561220A
Expired / Lapsed
US
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Method and apparatus for containing well pollutants
Assignee: Individual
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Filing: 1969-03-26
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Granted: 1971-02-09
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Expires: 1989-03-26
Abstract
Abstract A WELL INSTALLATION APPARATUS AND METHOD, PARTICULARLY FOR OFFSHORE WELLS, UTILIZING A LARGE COFFER OR CAISSON SURROUNDING THE WELL POINT, SUCH COFFER OR CAISSON INCLUDING A SUBMERGED CAISSON HAVING SECURED TO THE TOP THEREOF AN ANNULAR AXIALLY EXPANSIBLE SUBSTANTIALLY WATER IMPERMEABLE EXTENSION SECURED AT ITS LOWER END TO THE TOP OF THE SUBMERGED CAISSON AND AT ITS TOP TO A FLOATING RING.
Inventors
- 👤 Chester George Riester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:17
CPC Classifications
E; E02; E02B; E02B15/00; E02B15/04; E02B15/08; E02B15/0857; E02B15/0864; E21; E21B; E21B41/00; E21B41/005; E21B43/00; E21B43/01; E21B43/0122
Claims Analysis
Total Claims: 0
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |