Patent US3065794A successfully refreshed from Google Patents.
US3065794A
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Retrievable well flow control valve
Assignee: Page Oil Tools Inc
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Filing: 1957-08-19
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Granted: 1962-11-27
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Expires: 1977-08-19
Abstract
No abstract record available.
Inventors
- 👤 John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:29
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2676661A
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US2698056A
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US2813588A
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GB774785A
Cited
GB774783A
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US2872238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-26 | 1966-05-28 | 1966-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-26 | 1970-05-28 | 1970-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-26 | 1974-05-28 | 1974-11-27 | $7700.00 | Window Closed / Lapsed |