Patent US2753474A successfully refreshed from Google Patents.
Patent US2411667A successfully refreshed from Google Patents.
US2411667A
Expired / Lapsed
US
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Bottom hole regulator
Assignee: Individual
•
Filing: 1942-07-29
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Granted: 1946-11-26
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Expires: 1962-07-29
Abstract
No abstract record available.
Inventors
- 👤 Lester D Mowrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7785; Y10T137/7837; Y10T137/7847; Y10T137/7848; Y10T137/7854; Y10T137/7856; Y10T137/8593; Y10T137/87169
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-11-25 | 1950-05-27 | 1950-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-11-25 | 1954-05-27 | 1954-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-11-25 | 1958-05-27 | 1958-11-26 | $7700.00 | Window Closed / Lapsed |