Patent US3426844A successfully refreshed from Google Patents.
US3426844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drilling underwater wells
Assignee: Texaco Inc
•
Filing: 1966-12-20
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Granted: 1969-02-11
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Expires: 1986-12-20
Abstract
No abstract record available.
Inventors
- 👤 Alan R Mcdaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:52
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/128
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2808229A
Cited
US2929610A
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US2891770A
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US3145775A
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US3292694A
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US3338303A
Cited
US3340928A
Cited
US3376922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |