Patent US4224537A successfully refreshed from Google Patents.
US3035641A
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Down tubing self-closing flow control valve
Assignee: Page Oil Tools Inc
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Filing: 1957-11-15
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Granted: 1962-05-22
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Expires: 1977-11-15
Abstract
No abstract record available.
Inventors
- 👤 John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:58
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)
US2780290A
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US2785755A
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US2786535A
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US2798561A
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US2971581A
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US2894715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-21 | 1965-11-20 | 1966-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-21 | 1969-11-20 | 1970-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-21 | 1973-11-20 | 1974-05-22 | $7700.00 | Window Closed / Lapsed |