Patent US2570667A successfully refreshed from Google Patents.
US2570667A
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US
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Valve for oil well tubing
Assignee: Individual
•
Filing: 1949-01-17
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Granted: 1951-10-09
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Expires: 1969-01-17
Abstract
No abstract record available.
Inventors
- 👤 William E Halbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:00
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)
US1316171A
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US1429566A
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US925859A
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US1512597A
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US1861396A
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US2089477A
Cited
US2314869A
Cited
US2348564A
Cited
US2398527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |