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US2786535A
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Subsurface blowout preventer
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-12-21
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Granted: 1957-03-26
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Expires: 1974-12-21
Abstract
No abstract record available.
Inventors
- 👤 Boer George
- 👤 Martin E True
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:45
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B34/00; E21B34/06; E21B34/10; E21B2200/00; E21B2200/03; E21B2200/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2080610A
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US2207944A
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US2157263A
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US2104660A
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US2592325A
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US2504006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |