Patent US2594831A successfully refreshed from Google Patents.
US2594831A
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Well flow device
Assignee: Merla Tool Corp
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Filing: 1947-11-12
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Granted: 1952-04-29
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Expires: 1967-11-12
Abstract
No abstract record available.
Inventors
- 👤 Robert O Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US738026A
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GB191400309A
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US1593115A
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US1542612A
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US1632403A
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US2025296A
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US2314869A
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US2368406A
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US2368999A
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US2342301A
Cited
US2385316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |