US2628819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen arrangement for use in conjunction with oil well drilling turbines
Assignee: ENGINEERING DEV Co Inc
•
Filing: 1949-11-22
•
Granted: 1953-02-17
•
Expires: 1969-11-22
Abstract
No abstract record available.
Inventors
- 👤 Parsons Critchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:43
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1730578A
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US1356547A
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US2056471A
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US2068837A
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US2042921A
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US2078543A
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US2265550A
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US2304492A
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US2418247A
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US2530283A
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US2571059A
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US2540564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |