US2522444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well fluid control
Assignee: Individual
•
Filing: 1946-07-20
•
Granted: 1950-09-12
•
Expires: 1966-07-20
Abstract
No abstract record available.
Inventors
- 👤 Donovan B Grable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:48
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B21/00; E21B21/01; E21B21/019
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1427811A
Cited
US1521390A
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US1852512A
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US1854058A
Cited
US1910634A
Cited
US1910762A
Cited
US2027734A
Cited
US2054337A
Cited
US2162179A
Cited
US2352412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |