US3421580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater well completion method and apparatus
Assignee: Rockwell Manufacturing Co
•
Filing: 1966-08-15
•
Granted: 1969-01-14
•
Expires: 1986-08-15
Abstract
No abstract record available.
Inventors
- 👤 John H Fowler
- 👤 David P Herd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:15
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/09; E21B17/00; E21B17/01; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/04; E21B33/043; E21B41/00; E21B41/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3240511A
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US3310107A
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US3324951A
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US3330339A
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US3335799A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |