US3463226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater wellhead apparatus
Assignee: Shell USA Inc
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Filing: 1967-11-29
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Granted: 1969-08-26
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Expires: 1987-11-29
Abstract
No abstract record available.
Inventors
- 👤 Glenn D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:43
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; B; B25; B25J; B25J15/00; B25J9/00; B25J9/10; B25J9/14; B25J9/144; E21B41/00; E21B41/0007; E21B41/04; E21B7/00; E21B7/12
Claims Analysis
Total Claims: 0
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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) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |