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Patent US2551434A successfully refreshed from Google Patents.
US2551434A
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US
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Subsurface pump for flooding operations
Assignee: Shell Development Co
•
Filing: 1949-04-05
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Granted: 1951-05-01
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Expires: 1969-04-05
Abstract
No abstract record available.
Inventors
- 👤 Gray James Earle
- 👤 Davenport Eldon Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:35
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2214064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |